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Giammichele, N.; Bergeron, P.; Dufour, P. (April 2012), "Know Your Neighborhood: A Detailed Model Atmosphere Analysis of Nearby White Dwarfs", The Astrophysical Journal Supplement, 199 (2): 29, arXiv:1202.5581, डीओआइ:10.1088/0067-0049/199/2/29, बिबकोड:2012ApJS..199...29G Age is for the white dwarf stage.