sponsored by Swarthmore College, University of Lausanne, Institute for Space Observations ; edited by A. G. Davis Philip, Bernard Hauck and Arthur R. UpgrenL. Davis Press1993
International Astronomical Union Colloquium no. 88, held at Union College, Schenectady, New York, 24-27 October, 1984 ; edited by A.G. Davis Philip and David W. LathamL. Davis Press1985