Kimble R.A., B.E. Woodgate, C.W. Bowers, S.B. Kraemer, M.E. Kaiser, T.R. Gull, S.R. Heap, A.C. Danks, A. Boggess, R.F. Green, and J.B. Hutchings, The Astrophysical Journal 492, L83 - L93 (1998).
Heap S.R., J.C. Brandt, C.E. Randall, K.G. Carpenter, D.S. Leckrone, S.P. Maran, A.M. Smith, E.A. Beaver, A. Boggess, D.C. Ebbets, and H. Garner, Publications Of The Astronomical Society Of The Pacific 107, 871 (1995).