1. Ceppellini, R., Bedarida, G., Carbonara, A. O., Trinchieri, G., and Filippi, G., Atti Convegni Farmitalia: Antigene Australia ed Epatite Virale, 53 (Minerva Medica, Torino, 1970).
2. Blumberg, B. S., Bull. Acad. Med., Toronto, 45, 45 (1972).
3. Okochi, K., Mayumi, M., and Yishioka, K., in Proc. third int. Symp. Princess Takamatsu Cancer Research Fund, Tokyo (November 1972).
4. Turner, G. C., Field, A. M., Lasheen, R. M., Todd, R. McL., White, G. B. B., and Porter, A. A., Archs. Dis. Child., 46, 616 (1971).
5. Merrill, D. A., Dubois, R. S., and Kohler, P. F., New Engl. J. Med., 287, 1280 (1972).