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Mamajek’s research has addressed the formation, evolution, and characterization of stars, substellar objects, and exoplanetary systems, especially in the solar neighborhood. He has worked on determining stellar ages, distances,<ref>{{cite journal |last1=Bowler |first1=Brendan P. |title=Imaging Extrasolar Giant Planets |journal=Publications of the Astronomical Society of the Pacific |date=2016 |volume=128 |issue=968 |pages=102001 |doi=10.1088/1538-3873/128/968/102001 |arxiv=1605.02731 |bibcode=2016PASP..128j2001B |url=https://iopscience.iop.org/article/10.1088/1538-3873/128/968/102001}}</ref> and kinematics of young stars and associations,<ref>{{cite journal |last1=Schlieder |first1=Joshua E. |last2=Skemer |first2=Andrew J. |last3=Maire |first3=Anne-Lise |last4=Desidera |first4=Silvano |last5=Hinz |first5=Philip |last6=Skrutskie |first6=Michael F.|display-authors=et. al |title=THE LEECH EXOPLANET IMAGING SURVEY: ORBIT AND COMPONENT MASSES OF THE INTERMEDIATE-AGE, LATE-TYPE BINARY NO UMa|journal=The Astrophysical Journal |date=2016 |volume=818 |issue=1 |pages=1 |doi=10.3847/0004-637x/818/1/1 |arxiv=1510.03813 |bibcode=2016ApJ…818….1S |doi-access=free }}</ref> as well as [[protoplanetary disk]]s around stars.<ref>{{cite journal |last1=Bitsch |first1=Bertram |last2=Lambrechts |first2=Michiel |last3=Johansen |first3=Anders |title=The growth of planets by pebble accretion in evolving protoplanetary discs |journal=Astronomy & Astrophysics |date=2015 |volume=582 |pages=A112 |doi=10.1051/0004-6361/201526463 |arxiv=1507.05209 |bibcode=2015A&A…582A.112B |url=https://www.aanda.org/articles/aa/full_html/2015/10/aa26463-15/aa26463-15.html }}</ref> He has determined rotation periods,<ref>{{cite journal |last1=Johnstone |first1=C. P. |last2=Bartel |first2=M. |last3=Güdel |first3=M. |title=The active lives of stars: A complete description of the rotation and XUV evolution of F, G, K, and M dwarfs |journal=Astronomy & Astrophysics |date=2021 |volume=649 |pages=A96 |doi=10.1051/0004-6361/202038407 |arxiv=2009.07695 |bibcode=2021A&A…649A..96J |url=https://www.aanda.org/articles/aa/full_html/2021/05/aa38407-20/aa38407-20.html}}</ref> X-ray luminosities, and studied the association between magnetically generated stellar rotation and coronal activity.<ref>{{cite journal |last1=Davenport |first1=James R. A. |title=The Kepler Catalog of Stellar Flares |journal=The Astrophysical Journal |date=2016 |volume=829 |issue=1 |pages=23 |doi=10.3847/0004-637x/829/1/23 |arxiv=1607.03494 |bibcode=2016ApJ…829…23D |doi-access=free }}</ref>

Mamajek’s research has addressed the formation, evolution, and characterization of stars, substellar objects, and exoplanetary systems, especially in the solar neighborhood. He has worked on determining stellar ages, distances,<ref>{{cite journal |last1=Bowler |first1=Brendan P. |title=Imaging Extrasolar Giant Planets |journal=Publications of the Astronomical Society of the Pacific |date=2016 |volume=128 |issue=968 |pages=102001 |doi=10.1088/1538-3873/128/968/102001 |arxiv=1605.02731 |bibcode=2016PASP..128j2001B |url=https://iopscience.iop.org/article/10.1088/1538-3873/128/968/102001}}</ref> and kinematics of young stars and associations,<ref>{{cite journal |last1=Schlieder |first1=Joshua E. |last2=Skemer |first2=Andrew J. |last3=Maire |first3=Anne-Lise |last4=Desidera |first4=Silvano |last5=Hinz |first5=Philip |last6=Skrutskie |first6=Michael F.|display-authors=et. al |title=THE LEECH EXOPLANET IMAGING SURVEY: ORBIT AND COMPONENT MASSES OF THE INTERMEDIATE-AGE, LATE-TYPE BINARY NO UMa|journal=The Astrophysical Journal |date=2016 |volume=818 |issue=1 |pages=1 |doi=10.3847/0004-637x/818/1/1 |arxiv=1510.03813 |bibcode=2016ApJ…818….1S |doi-access=free }}</ref> as well as [[protoplanetary disk]]s around stars.<ref>{{cite journal |last1=Bitsch |first1=Bertram |last2=Lambrechts |first2=Michiel |last3=Johansen |first3=Anders |title=The growth of planets by pebble accretion in evolving protoplanetary discs |journal=Astronomy & Astrophysics |date=2015 |volume=582 |pages=A112 |doi=10.1051/0004-6361/201526463 |arxiv=1507.05209 |bibcode=2015A&A…582A.112B |url=https://www.aanda.org/articles/aa/full_html/2015/10/aa26463-15/aa26463-15.html }}</ref> He has determined rotation periods,<ref>{{cite journal |last1=Johnstone |first1=C. P. |last2=Bartel |first2=M. |last3=Güdel |first3=M. |title=The active lives of stars: A complete description of the rotation and XUV evolution of F, G, K, and M dwarfs |journal=Astronomy & Astrophysics |date=2021 |volume=649 |pages=A96 |doi=10.1051/0004-6361/202038407 |arxiv=2009.07695 |bibcode=2021A&A…649A..96J |url=https://www.aanda.org/articles/aa/full_html/2021/05/aa38407-20/aa38407-20.html}}</ref> X-ray luminosities, and studied the association between magnetically generated stellar rotation and coronal activity.<ref>{{cite journal |last1=Davenport |first1=James R. A. |title=The Kepler Catalog of Stellar Flares |journal=The Astrophysical Journal |date=2016 |volume=829 |issue=1 |pages=23 |doi=10.3847/0004-637x/829/1/23 |arxiv=1607.03494 |bibcode=2016ApJ…829…23D |doi-access=free }}</ref>

Mamajek is the [[eponym]] of “Mamajek’s Law” for the increasing discovery rate of exoplanets,<ref>{{cite journal |last1=Paice |first1=John |last2=Watkins |first2=Jack |title=On the Possibility of Discovering Exoplanets within our Solar System |journal=arXiv preprint |date=2022 |arxiv=2203.17075 |url=https://arxiv.org/abs/2203.17075}}</ref><ref>{{Cite web|url=https://wgarrettlevine.substack.com/p/moores-law-of-exoplanets?utm_campaign=post&utm_medium=web&utm=|title=Moore’s law of exoplanets|website=W. Garrett Levine on Substack|date=6 March 2025 |access-date=October 7, 2025}}</ref> and is codiscoverer the ringed [[substellar object]] [[J1407b]], which has sometimes been called “Mamajek’s Object”.<ref>{{Cite web|url=https://ourplnt.com/super-saturn-j1407b/|title=Super Saturn: J1407b|website=OurPlnt|date=10 August 2019 |access-date=October 7, 2025}}</ref> A focus of his research work lies in calibrating and applying age-dating techniques for stars<ref>{{cite journal |last1=Brandt |first1=Timothy D. |last2=Kuzuhara |first2=Masayuki |last3=McElwain |first3=Michael W. |last4=Schlieder |first4=Joshua E. |last5=Wisniewski |first5=John P. |last6=Turner |first6=Edwin L. |display-authors=et. al |title=The Moving Group Targets of the Seeds High-Contrast Imaging Survey of Exoplanets and Disks: Results and Observations from the First Three Years |journal=The Astrophysical Journal |date=2014 |volume=786 |issue=1 |pages=1 |doi=10.1088/0004-637x/786/1/1 |arxiv=1305.7264 |bibcode=2014ApJ…786….1B |url=https://iopscience.iop.org/article/10.1088/0004-637X/786/1/1}}</ref> and young stellar groups.<ref>{{cite journal |last1=Choi |first1=Jieun |last2=Dotter |first2=Aaron |last3=Conroy |first3=Charlie |last4=Cantiello |first4=Matteo |last5=Paxton |first5=Bill |last6=Johnson |first6=Benjamin D. |title=Mesa Isochrones and Stellar Tracks (Mist). I. Solar-Scaled Models |journal=The Astrophysical Journal |date=2016 |volume=823 |issue=2 |pages=102 |doi=10.3847/0004-637x/823/2/102 |arxiv=1604.08592 |bibcode=2016ApJ…823..102C |doi-access=free }}</ref> Similarly, he has investigated young open clusters and stellar associations<ref>{{cite journal |last1=Cantat-Gaudin |first1=Tristan |title=Milky Way Star Clusters and Gaia: A Review of the Ongoing Revolution |journal=Universe |date=2022 |volume=8 |issue=2 |pages=111 |doi=10.3390/universe8020111 |bibcode=2022Univ….8..111C |doi-access=free }}</ref> and utilized [[Bayesian inference]] to calculate membership probability for 29 stellar associations within 150 parsecs of the Sun.<ref>{{cite journal |last1=Kirkpatrick |first1=J. Davy |last2=Gelino |first2=Christopher R. |last3=Faherty |first3=Jacqueline K. |last4=Meisner |first4=Aaron M. |last5=Caselden |first5=Dan |last6=Schneider |first6=Adam C. |display-authors=et. al|title=The Field Substellar Mass Function Based on the Full-sky 20 pc Census of 525 L, T, and Y Dwarfs |journal=The Astrophysical Journal Supplement Series |date=2021 |volume=253 |issue=1 |pages=7 |doi=10.3847/1538-4365/abd107 |arxiv=2011.11616 |bibcode=2021ApJS..253….7K |doi-access=free }}</ref> His work has also explored the [[Scholz’s star]]’s Sun encounter.<ref>{{cite journal |last1=Burgasser |first1=Adam J. |last2=Melis |first2=Carl |last3=Todd |first3=Jacob |last4=Gelino |first4=Christopher R. |last5=Hallinan |first5=Gregg |last6=Gagliuffi |first6=Daniella Bardalez |title=RADIO EMISSION AND ORBITAL MOTION FROM THE CLOSE-ENCOUNTER STAR–BROWN DWARF BINARY WISE J072003.20–084651.2 |journal=The Astronomical Journal |date=2015 |volume=150 |issue=6 |pages=180 |doi=10.1088/0004-6256/150/6/180 |arxiv=1508.06332 |bibcode=2015AJ….150..180B |url=https://iopscience.iop.org/article/10.1088/0004-6256/150/6/180}}</ref> In collaboration with Stapelfeldt, he has documented the list of nearby stars which will be the best target stars for the future NASA [[Habitable Worlds Observatory]] to search for potentially habitable worlds.<ref> {{cite journal |last1=Sagynbayeva |first1=Sabina |last2=Abbas |first2=Asif |last3=Kane |first3=Stephen R. |last4=Nielsen |first4=Eric L. |last5=Thompson |first5=William |display-authors=et. al|year=2025 |title=Requirements for Joint Orbital Characterization of Cold Giants and Habitable Worlds with Habitable Worlds Observatory |journal=The Astronomical Journal |volume=170 |issue=4 |page=208 |doi=10.3847/1538-3881/adf84d |arxiv=2507.21443 |bibcode=2025AJ….170..208S |doi-access=free }}</ref>

Mamajek is the [[eponym]] of “Mamajek’s Law” for the increasing discovery rate of exoplanets,<ref>{{cite journal |last1=Paice |first1=John |last2=Watkins |first2=Jack |title=On the Possibility of Discovering Exoplanets within our Solar System |journal=arXiv preprint |date=2022 |arxiv=2203.17075 |url=https://arxiv.org/abs/2203.17075}}</ref><ref>{{Cite web|url=https://wgarrettlevine.substack.com/p/moores-law-of-exoplanets?utm_campaign=post&utm_medium=web&utm=|title=Moore’s law of exoplanets|website=W. Garrett Levine on Substack|date=6 March 2025 |access-date=October 7, 2025}}</ref> and is the ringed [[substellar object]] [[J1407b]], which has sometimes been called “Mamajek’s Object”.<ref>{{Cite web|url=https://ourplnt.com/super-saturn-j1407b/|title=Super Saturn: J1407b|website=OurPlnt|date=10 August 2019 |access-date=October 7, 2025}}</ref> A focus of his research work lies in calibrating and applying age-dating techniques for stars<ref>{{cite journal |last1=Brandt |first1=Timothy D. |last2=Kuzuhara |first2=Masayuki |last3=McElwain |first3=Michael W. |last4=Schlieder |first4=Joshua E. |last5=Wisniewski |first5=John P. |last6=Turner |first6=Edwin L. |display-authors=et. al |title=The Moving Group Targets of the Seeds High-Contrast Imaging Survey of Exoplanets and Disks: Results and Observations from the First Three Years |journal=The Astrophysical Journal |date=2014 |volume=786 |issue=1 |pages=1 |doi=10.1088/0004-637x/786/1/1 |arxiv=1305.7264 |bibcode=2014ApJ…786….1B |url=https://iopscience.iop.org/article/10.1088/0004-637X/786/1/1}}</ref> and young stellar groups.<ref>{{cite journal |last1=Choi |first1=Jieun |last2=Dotter |first2=Aaron |last3=Conroy |first3=Charlie |last4=Cantiello |first4=Matteo |last5=Paxton |first5=Bill |last6=Johnson |first6=Benjamin D. |title=Mesa Isochrones and Stellar Tracks (Mist). I. Solar-Scaled Models |journal=The Astrophysical Journal |date=2016 |volume=823 |issue=2 |pages=102 |doi=10.3847/0004-637x/823/2/102 |arxiv=1604.08592 |bibcode=2016ApJ…823..102C |doi-access=free }}</ref> Similarly, he has investigated young open clusters and stellar associations<ref>{{cite journal |last1=Cantat-Gaudin |first1=Tristan |title=Milky Way Star Clusters and Gaia: A Review of the Ongoing Revolution |journal=Universe |date=2022 |volume=8 |issue=2 |pages=111 |doi=10.3390/universe8020111 |bibcode=2022Univ….8..111C |doi-access=free }}</ref> and utilized [[Bayesian inference]] to calculate membership probability for 29 stellar associations within 150 parsecs of the Sun.<ref>{{cite journal |last1=Kirkpatrick |first1=J. Davy |last2=Gelino |first2=Christopher R. |last3=Faherty |first3=Jacqueline K. |last4=Meisner |first4=Aaron M. |last5=Caselden |first5=Dan |last6=Schneider |first6=Adam C. |display-authors=et. al|title=The Field Substellar Mass Function Based on the Full-sky 20 pc Census of 525 L, T, and Y Dwarfs |journal=The Astrophysical Journal Supplement Series |date=2021 |volume=253 |issue=1 |pages=7 |doi=10.3847/1538-4365/abd107 |arxiv=2011.11616 |bibcode=2021ApJS..253….7K |doi-access=free }}</ref> His work has also explored the [[Scholz’s star]]’s Sun encounter.<ref>{{cite journal |last1=Burgasser |first1=Adam J. |last2=Melis |first2=Carl |last3=Todd |first3=Jacob |last4=Gelino |first4=Christopher R. |last5=Hallinan |first5=Gregg |last6=Gagliuffi |first6=Daniella Bardalez |title=RADIO EMISSION AND ORBITAL MOTION FROM THE CLOSE-ENCOUNTER STAR–BROWN DWARF BINARY WISE J072003.20–084651.2 |journal=The Astronomical Journal |date=2015 |volume=150 |issue=6 |pages=180 |doi=10.1088/0004-6256/150/6/180 |arxiv=1508.06332 |bibcode=2015AJ….150..180B |url=https://iopscience.iop.org/article/10.1088/0004-6256/150/6/180}}</ref> In collaboration with Stapelfeldt, he has documented the list of nearby stars which will be the best target stars for the future NASA [[Habitable Worlds Observatory]] to search for potentially habitable worlds.<ref> {{cite journal |last1=Sagynbayeva |first1=Sabina |last2=Abbas |first2=Asif |last3=Kane |first3=Stephen R. |last4=Nielsen |first4=Eric L. |last5=Thompson |first5=William |display-authors=et. al|year=2025 |title=Requirements for Joint Orbital Characterization of Cold Giants and Habitable Worlds with Habitable Worlds Observatory |journal=The Astronomical Journal |volume=170 |issue=4 |page=208 |doi=10.3847/1538-3881/adf84d |arxiv=2507.21443 |bibcode=2025AJ….170..208S |doi-access=free }}</ref>

Mamajek’s research has been cited over 24,000 times and he has an h-index of 81 according to Google Scholar.<ref>{{cite web|url=https://scholar.google.com/citations?user=qQsWNi4AAAAJ&hl=en|title=Eric Mamajek – Google Scholar}}</ref>

Mamajek’s research has been cited over 24,000 times and he has an h-index of 81 according to Google Scholar.<ref>{{cite web|url=https://scholar.google.com/citations?user=qQsWNi4AAAAJ&hl=en|title=Eric Mamajek – Google Scholar}}</ref>

Latest revision as of 08:47, 23 December 2025

Eric E. Mamajek (born 1975) is an American astrophysicist. He is a principal scientist at the Jet Propulsion Laboratory (JPL) and the deputy program chief scientist for the NASA Exoplanet Exploration Program.

Mamajek’s research interests have focused on the formation and evolution of stars, planets, substellar objects, and circumstellar disks, with an emphasis on characterizing stars’ ages and membership in kinematic groups and multiple systems.

Early life and education

[edit]

Mamajek was born in Pittsburgh, Pennsylvania, in 1975.[1] graduated from Bethel Park High School in 1993[2] and completed his bachelor of science from Penn State University in 1998. Later in 2000, he earned a master of science in physics from the University of New South Wales. He later studied at the University of Arizona, where he received his master of science and Ph.D. in astronomy in 2001 and 2004, respectively.[3]

In 2008, Mamajek joined the University of Rochester as an assistant professor,[3] became associate professor in 2013 and professor in 2016. In 2016, he was appointed as deputy program chief scientist for NASA’s Exoplanet Exploration Program at the JPL and was promoted to JPL principal scientist in the Astrophysics and Space Sciences directorate.[1]

Mamajek was the chair of the IAU Working Group on Star Names from 2016 to 2021.[4]

Mamajek’s research has addressed the formation, evolution, and characterization of stars, substellar objects, and exoplanetary systems, especially in the solar neighborhood. He has worked on determining stellar ages, distances,[5] and kinematics of young stars and associations,[6] as well as protoplanetary disks around stars.[7] He has determined rotation periods,[8] X-ray luminosities, and studied the association between magnetically generated stellar rotation and coronal activity.[9]

Mamajek is the eponym of “Mamajek’s Law” for the increasing discovery rate of exoplanets,[10][11] and is the co-discoverer of the ringed substellar object J1407b, which has sometimes been called “Mamajek’s Object”.[12] A focus of his research work lies in calibrating and applying age-dating techniques for stars[13] and young stellar groups.[14] Similarly, he has investigated young open clusters and stellar associations[15] and utilized Bayesian inference to calculate membership probability for 29 stellar associations within 150 parsecs of the Sun.[16] His work has also explored the Scholz’s star‘s Sun encounter.[17] In collaboration with Stapelfeldt, he has documented the list of nearby stars which will be the best target stars for the future NASA Habitable Worlds Observatory to search for potentially habitable worlds.[18]

Mamajek’s research has been cited over 24,000 times and he has an h-index of 81 according to Google Scholar.[19]

  1. ^ a b c “Dr. Eric E. Mamajek” (PDF). Science.jpl.nasa.gov. Retrieved December 4, 2025.
  2. ^ “Celestial Foundlings”. Pittsburgh Post-Gazette Pittsburgh. June 7, 1999.
  3. ^ a b “Teacher Feature: UR professor discovers Saturn-like ring system”.
  4. ^ “IAU Member Information – Eric Mamajek”.
  5. ^ Bowler, Brendan P. (2016). “Imaging Extrasolar Giant Planets”. Publications of the Astronomical Society of the Pacific. 128 (968): 102001. arXiv:1605.02731. Bibcode:2016PASP..128j2001B. doi:10.1088/1538-3873/128/968/102001.{{cite journal}}: CS1 maint: article number as page number (link)
  6. ^ Schlieder, Joshua E.; Skemer, Andrew J.; Maire, Anne-Lise; Desidera, Silvano; Hinz, Philip; Skrutskie, Michael F.; et al. (2016). “THE LEECH EXOPLANET IMAGING SURVEY: ORBIT AND COMPONENT MASSES OF THE INTERMEDIATE-AGE, LATE-TYPE BINARY NO UMa”. The Astrophysical Journal. 818 (1): 1. arXiv:1510.03813. Bibcode:2016ApJ…818….1S. doi:10.3847/0004-637x/818/1/1.
  7. ^ Bitsch, Bertram; Lambrechts, Michiel; Johansen, Anders (2015). “The growth of planets by pebble accretion in evolving protoplanetary discs”. Astronomy & Astrophysics. 582: A112. arXiv:1507.05209. Bibcode:2015A&A…582A.112B. doi:10.1051/0004-6361/201526463.
  8. ^ Johnstone, C. P.; Bartel, M.; Güdel, M. (2021). “The active lives of stars: A complete description of the rotation and XUV evolution of F, G, K, and M dwarfs”. Astronomy & Astrophysics. 649: A96. arXiv:2009.07695. Bibcode:2021A&A…649A..96J. doi:10.1051/0004-6361/202038407.
  9. ^ Davenport, James R. A. (2016). “The Kepler Catalog of Stellar Flares”. The Astrophysical Journal. 829 (1): 23. arXiv:1607.03494. Bibcode:2016ApJ…829…23D. doi:10.3847/0004-637x/829/1/23.
  10. ^ Paice, John; Watkins, Jack (2022). “On the Possibility of Discovering Exoplanets within our Solar System”. arXiv preprint. arXiv:2203.17075.
  11. ^ “Moore’s law of exoplanets”. W. Garrett Levine on Substack. 6 March 2025. Retrieved October 7, 2025.
  12. ^ “Super Saturn: J1407b”. OurPlnt. 10 August 2019. Retrieved October 7, 2025.
  13. ^ Brandt, Timothy D.; Kuzuhara, Masayuki; McElwain, Michael W.; Schlieder, Joshua E.; Wisniewski, John P.; Turner, Edwin L.; et al. (2014). “The Moving Group Targets of the Seeds High-Contrast Imaging Survey of Exoplanets and Disks: Results and Observations from the First Three Years”. The Astrophysical Journal. 786 (1): 1. arXiv:1305.7264. Bibcode:2014ApJ…786….1B. doi:10.1088/0004-637x/786/1/1.
  14. ^ Choi, Jieun; Dotter, Aaron; Conroy, Charlie; Cantiello, Matteo; Paxton, Bill; Johnson, Benjamin D. (2016). “Mesa Isochrones and Stellar Tracks (Mist). I. Solar-Scaled Models”. The Astrophysical Journal. 823 (2): 102. arXiv:1604.08592. Bibcode:2016ApJ…823..102C. doi:10.3847/0004-637x/823/2/102.
  15. ^ Cantat-Gaudin, Tristan (2022). “Milky Way Star Clusters and Gaia: A Review of the Ongoing Revolution”. Universe. 8 (2): 111. Bibcode:2022Univ….8..111C. doi:10.3390/universe8020111.
  16. ^ Kirkpatrick, J. Davy; Gelino, Christopher R.; Faherty, Jacqueline K.; Meisner, Aaron M.; Caselden, Dan; Schneider, Adam C.; et al. (2021). “The Field Substellar Mass Function Based on the Full-sky 20 pc Census of 525 L, T, and Y Dwarfs”. The Astrophysical Journal Supplement Series. 253 (1): 7. arXiv:2011.11616. Bibcode:2021ApJS..253….7K. doi:10.3847/1538-4365/abd107.
  17. ^ Burgasser, Adam J.; Melis, Carl; Todd, Jacob; Gelino, Christopher R.; Hallinan, Gregg; Gagliuffi, Daniella Bardalez (2015). “RADIO EMISSION AND ORBITAL MOTION FROM THE CLOSE-ENCOUNTER STAR–BROWN DWARF BINARY WISE J072003.20–084651.2”. The Astronomical Journal. 150 (6): 180. arXiv:1508.06332. Bibcode:2015AJ….150..180B. doi:10.1088/0004-6256/150/6/180.
  18. ^ Sagynbayeva, Sabina; Abbas, Asif; Kane, Stephen R.; Nielsen, Eric L.; Thompson, William; et al. (2025). “Requirements for Joint Orbital Characterization of Cold Giants and Habitable Worlds with Habitable Worlds Observatory”. The Astronomical Journal. 170 (4): 208. arXiv:2507.21443. Bibcode:2025AJ….170..208S. doi:10.3847/1538-3881/adf84d.
  19. ^ “Eric Mamajek – Google Scholar”.

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