Doyle J., B.J. Kellett, C.J. Butler, P.B. Byrne, J.E. Neff, A. Brown, D. Fox, J.L. Linsky, G.E. Bromage, S. Avgoloupis, and L.N. Mavridis, Astronomy And Astrophysics Supplement Series 96, 351-373 (1992).
Kowalski M.P., R.G. Cruddace, K.S. Wood, D.J. Yentis, M.T. Wolff, J.M. Laming, H. Gursky, G.R. Carruthers, T.W. Barbee, J.F. Kordas, and C.W. Mauche, in (SPIE, San Diego, Ca, 2003).