Reprinted from: Astrophysical journal, v. 459, no. 2 (Mar. 10, 1996).
Originally published: Chicago, Ill., American Astronomical Society, 1996.
Shipping list no: 98-0348-M.
Microfiche. [Washington, D.C. : National Aeronautics and Space Administration, 1997] : 1 microfiche.