1. 4. F. Chiappelli, L. Nguyen, H. Gwirtsman, G. Gormley, M. Lowy, H. Weiner, I. Esmail, and J. Fahey, 1989 . 7th Int. Cong. Immunology.
2. 5. F. Chiappelli, H. Gwirtsman, G. Gormley, M. Lowy, L. Nguyen, I. Esmail, H. Weiner, and J. Fahey, 1990 . Submitted for publication.