Additional ultracool white dwarfs found in the sloan digital sky survey

Hugh C. Harris, Evalyn Gates, Geza Gyuk, Mark Subbarao, Scott F. Anderson, Patrick B. Hall, Jeffrey A. Munn, James Liebert, Gillian R. Knapp, D. Bizyaev, E. Malanushenko, V. Malanushenko, K. Pan, Donald P. Schneider, J. Allyn Smith