1. Pierpaoli, W., and Sorkin, E., Nature, 215, 834 (1967).
2. Pierpaoli, W., and Sorkin, E., Immunology, 16, 311 (1969).
3. Pierpaoli, W., Fabris, N., and Sorkin, E., Hormones and the Immune Response, Ciba Foundation Study Group No. 36 (edit. by Wolstenholme, G. E. W., and Knight, Julie), 126 (Churchill, London, 1970).
4. Pierpaoli, W., and Sorkin, E., J. Immunol., 101, 1036 (1968).
5. Pierpaoli, W., and Sorkin, E., Antibiotica et Chemotherapia, (edit. by Sorkin, E.), 15, 122 (Karger, Basel, 1969).