1. J. Folkman & D. M. Long, J. Surg. Res., 4, 139 (1964).
2. J. Folkman, D. M. Long, Jr. & R. Rosenbaum, Science, 154, 148 (1966).
3. D. M. Long, Jr. & J. Folkman, U.S. Patent 3,279,996 (1966).
4. P. J. Dziuk & B. Cook, Endocrinology, 78, 208 (1966).
5. V. Lee & J. R. Robinson, In: “Sustained and Controlled Release Drug Delivery Systems”, J. R. Robinson, Ed., Marcel Dekker, Inc., New York, 1985.