Lawrence M. Wein, Rebecca M. D'Amato, Alan S. Perelson.
Includes bibliographical references (p. 34-39).
Supported by the Santa Fe Institute through a grant from the Jeanne M. Sullivan and Joseph P. Sullivan Foundation, a National Defense Science and Engineering Graduate Fellowship from the Department of Defense, and a grant from the NIH. RR06555 Also supported by a grant from the National Science Foundation. DDM-9057297