1. E.S.E. Hafez, W.A.A. van Os (Eds.), Biodegradables and Delivery Systems for Contraception, Progress in Contraceptive Delivery Systems, E.S.E. Hafez, (Ser. Ed.), vol. 1, MTP Press, Lancaster, 1980.
2. C.G. Pitt, T.A. Marks, A. Schindler, Biodegradable delivery systems based on aliphatic polyesters: Application to contraceptives and narcotic antagonists, in: R. Baker (Ed.), Controlled Release of Bioactive Materials, Academic, New York, 1980, pp. 19–43.
3. H.A. Nash, Controlled release systems for contraception, in: R.S. Langer, D.L. Wise (Eds.), Medical Applications of Controlled Release, CRC Press, Boca Raton, 1984, pp. 36–64.
4. D.H. Lewis, Controlled release of bioactive agents from lactide/glycolide polymers, in: M. Chasin, R. Langer (Eds.), Biodegradable Polymers as Drug Delivery Systems, Marcel Dekker, New York, 1990, pp. 1–42.
5. C.G. Pitt, Poly(ϵ-caprolactone) and its copolymers, in: M. Chasin, R. Langer (Eds.), Biodegradable Polymers as Drug Delivery Systems, Marcel Dekker, New York, 1990, pp. 71–120.