Davies, John K.; McFarland, John; Bailey, Mark E.; Marsden, Brian G.; et al. (2008). "The Early Development of Ideas Concerning the Transneptunian Region"(PDF). In Baracci, M. Antonietta; Boenhardt, Hermann; Cruikchank, Dale; Morbidelli, Alissandro (eds.). The Solar System Beyond Neptune. University of Arizona Press. pp. 11–23. Archived from the original(PDF) on 2015-02-20. Retrieved 2014-11-05.
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Meyersohn, Ryanne Maxine (2023-05-28). Figueroa Nieves, Rosa Amelia (ed.). Estudio Comprensivo del Origen de la Humanidad [Comprehensive Study of the Origin of Humanity]. (n.p.). Retrieved 2024-10-19.
Standish, E. M. (May 1993). "Planet X - No dynamical evidence in the optical observations". The Astronomical Journal. 105 (5): 2000. Bibcode:1993AJ....105.2000S. doi:10.1086/116575.
Brown, Mike (August 2008). Pluto, Eris, and the dwarf planets of the outer solar system (academic talk). Smithsonian. Event occurs at 50ᵐ. Archived from the original on 2021-11-14. Retrieved 2 January 2019 – via YouTube. The argument about dwarf planet sizes beyond Neptune is 50ᵐ into his talk. The WGBH link doesn't work; view on YouTube.
Standish, E. M. (May 1993). "Planet X - No dynamical evidence in the optical observations". The Astronomical Journal. 105 (5): 2000. Bibcode:1993AJ....105.2000S. doi:10.1086/116575.
Central Bureau for Astronomical Telegrams, International Astronomical Union (2006). "Circular No. 8747"(PDF). Archived from the original on February 5, 2007. Retrieved 2011-07-05.
Davies, John K.; McFarland, John; Bailey, Mark E.; Marsden, Brian G.; et al. (2008). "The Early Development of Ideas Concerning the Transneptunian Region"(PDF). In Baracci, M. Antonietta; Boenhardt, Hermann; Cruikchank, Dale; Morbidelli, Alissandro (eds.). The Solar System Beyond Neptune. University of Arizona Press. pp. 11–23. Archived from the original(PDF) on 2015-02-20. Retrieved 2014-11-05.
Central Bureau for Astronomical Telegrams, International Astronomical Union (2006). "Circular No. 8747"(PDF). Archived from the original on February 5, 2007. Retrieved 2011-07-05.
Brown, Michael (11 April 2007). "Pluto and the outer solar system". Lowell Lectures in Astronomy. Boston, MA: Museum of Science, Boston / WGBH. Archived from the original on 2008-01-03. Retrieved 2008-07-13.
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Brown, Michael (11 April 2007). "Pluto and the outer solar system". Lowell Lectures in Astronomy. Boston, MA: Museum of Science, Boston / WGBH. Archived from the original on 2008-01-03. Retrieved 2008-07-13.
Brown, Mike (August 2008). Pluto, Eris, and the dwarf planets of the outer solar system (academic talk). Smithsonian. Event occurs at 50ᵐ. Archived from the original on 2021-11-14. Retrieved 2 January 2019 – via YouTube. The argument about dwarf planet sizes beyond Neptune is 50ᵐ into his talk. The WGBH link doesn't work; view on YouTube.