Pitt C.G., Marks T.A., Schindler A. (1980) Biodegradable Drug Delivery Systems Based on aliphatic Polyesters: Application to Contraceptives and Narcotic Antagonists. Controlled Release of Bioactive Materials, R. Baker, Academic, New York; .
Kulkarni R.K., Moore E.G., Hegyeli A.F., Leonard F. J. Biomed. Mater. Res. 1971, 5:169.
Dubois, Jerome R., Teyssie (1991) Aluminium alkoxides: A family of versatile initiators for the ring-opening polymerization of lactones and lactides. Makromolekulare Chemie. Macromolecular Symposia 42-43:103.
Kricheldorf H.R. α‐Amino Acid‐N‐Carboxyanhydrides and Related Heterocycles , Springer‐Verlag, Berlin; 1987, 59.