Jean-Louis M. Grevet ... [et al.].Caption title.Bibliography: p. 19.Supported, in part, by a grant from the National Science Foundation. SES84-19885 Supported, in part, by a grant from the Office of Naval Research. N00014-85-K-0782 Supported, in part, by a grant from the Office of Naval Research. N00014-84-K-0519 (NR 649-003)