Brandt J.C., S.R. Heap, E.A. Beaver, A. Boggess, K.G. Carpenter, D.C. Ebbets, J.B. Hutchings, M.A. Jura, D.S. Leckrone, J.L. Linsky, and S.P. Maran, The Astronomical Journal 116, 941-971 (1998).
Brandt J.C., S.R. Heap, E.A. Beaver, A. Boggess, K.G. Carpenter, D.C. Ebbets, J.B. Hutchings, M.A. Jura, D.S. Leckrone, J.L. Linsky, and S.P. Maran, The Astronomical Journal 112, 1128 (1996).