Hamilton A.J.S., and R.A. Fesen, in Unknown (Cambridge: University Press, Penticton, British Columbia, 1988).
Fesen R.A., C.L. Gerardy, K.M. McLin, and A.J.S. Hamilton, The Astrophysical Journal 514, 195-201 (1999).
Hamilton A.J.S., R.A. Fesen, C.-C. Wu, D.M. Crenshaw, and C.L. Sarazin, The Astrophysical Journal 481, 838-856 (1997).