https://www.universetoday.com/articles/dwarf-planet-eris
The Dwarf Planet Eris - Universe Today
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https://www.voanews.com/a/a-13-2007-06-19-voa45/343134.html
Astronomers Determine Mass and Density of Distant Dwarf Planet Eris
Advanced telescope technology helps astronomers clarify observations
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https://grognardia.blogspot.com/2020/10/review-planet-eris-gazetteer.html?m=0
GROGNARDIA: REVIEW: Planet Eris Gazetteer
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https://www.livescience.com/16760-dwarf-planet-eris-pluto-twin.html
Dwarf Planet Eris is 'Almost Perfect' Pluto Twin | Live Science
Oct 27, 2011 - The distant dwarf planet Eris could be an 'almost perfect' twin of pluto, scientists say. The two small worlds are nearly identical in size.
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