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 117, 1505-1548 (1999).
Miecznik G., and T. Brage, Journal Of Physics B: Atomic, Molecular And Optical Physics 28, 4233-4247 (1995).