1 N.H. Brummell, X.. Xie, J.. Toomre, and C.. Baillie, in Unknown (Astronomical Society of the Pacific, University of Southern California, Los Angeles, California, 1995).
1 F.. Cattaneo, N.H. Brummell, J.. Toomre, A.. Malagoli, and N.E. Hurlburt, The Astrophysical Journal 370, (1991).