N. Giammichele, P. Bergeron, P. Dufour: Know Your Neighborhood: A Detailed Model Atmosphere Analysis of Nearby White Dwarfs. In: The Astrophysical Journal Supplement. 199. Jahrgang, Nr.2, April 2012, S.29, doi:10.1088/0067-0049/199/2/29, arxiv:1202.5581, bibcode:2012ApJS..199...29G. Age is for the white dwarf stage.
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Daniel J. Schroeder, David A. Golimowski, Ryan A. Brukardt, Christopher J. Burrows, John J. Caldwell, William G. Fastie, Holland C. Ford, Brigette Hesman, Ilona Kletskin, John E. Krist, Patricia Royle, Richard. A. Zubrowski: A Search for Faint Companions to Nearby Stars Using the Wide Field Planetary Camera 2. In: The Astronomical Journal. 119. Jahrgang, Nr.2, Februar 2000, S.906–922, doi:10.1086/301227, bibcode:2000AJ....119..906S.
J. L. Provencal, H. L. Shipman, Detlev Koester, F. Wesemael, P. Bergeron: Procyon B: Outside the Iron Box. In: The Astrophysical Journal. 568. Jahrgang, Nr.1, 2002, S.324–334, doi:10.1086/338769, bibcode:2002ApJ...568..324P.
N. Giammichele, P. Bergeron, P. Dufour: Know Your Neighborhood: A Detailed Model Atmosphere Analysis of Nearby White Dwarfs. In: The Astrophysical Journal Supplement. 199. Jahrgang, Nr.2, April 2012, S.29, doi:10.1088/0067-0049/199/2/29, arxiv:1202.5581, bibcode:2012ApJS..199...29G. Age is for the white dwarf stage.
Daniel J. Schroeder, David A. Golimowski, Ryan A. Brukardt, Christopher J. Burrows, John J. Caldwell, William G. Fastie, Holland C. Ford, Brigette Hesman, Ilona Kletskin, John E. Krist, Patricia Royle, Richard. A. Zubrowski: A Search for Faint Companions to Nearby Stars Using the Wide Field Planetary Camera 2. In: The Astronomical Journal. 119. Jahrgang, Nr.2, Februar 2000, S.906–922, doi:10.1086/301227, bibcode:2000AJ....119..906S.
J. L. Provencal, H. L. Shipman, Detlev Koester, F. Wesemael, P. Bergeron: Procyon B: Outside the Iron Box. In: The Astrophysical Journal. 568. Jahrgang, Nr.1, 2002, S.324–334, doi:10.1086/338769, bibcode:2002ApJ...568..324P.
N. Giammichele, P. Bergeron, P. Dufour: Know Your Neighborhood: A Detailed Model Atmosphere Analysis of Nearby White Dwarfs. In: The Astrophysical Journal Supplement. 199. Jahrgang, Nr.2, April 2012, S.29, doi:10.1088/0067-0049/199/2/29, arxiv:1202.5581, bibcode:2012ApJS..199...29G. Age is for the white dwarf stage.