Holberg, Jay; Barstow, M.A.; Green, Elizabeth M. (1997). "The Discovery of Mg II λ4481 in the White Dwarf EG 102: Evidence for Ongoing Accretion". The Astrophysical Journal. 474 (2): L127–L130. Bibcode:1997ApJ...474L.127H. doi:10.1086/310446.
Holberg, Jay; Barstow, M.A.; Green, Elizabeth M. (1997). "The Discovery of Mg II λ4481 in the White Dwarf EG 102: Evidence for Ongoing Accretion". The Astrophysical Journal. 474 (2): L127–L130. Bibcode:1997ApJ...474L.127H. doi:10.1086/310446.