Caption title.
Includes bibliographical references (p. [3]-[4]).
Supported by the Army Research Office. DAAL-03-92-G-115 Supported by the Air Force Office of Scientific Research. F49620-92-J-2002 F49620-93-1-0102 Supported by the National Science Foundation. MIP-9015281 Supported by ONR. N00014-91-J-1967