| http://www.w3.org/ns/prov#value | - Particular polyesters which have been used are those derived from hydroxycarboxylic acids, and much prior art has been directed to polymers derived from alpha-hydroxycarboxylic acids, especially lactic acid in both its racemic and optically active forms, and glycolic acid, and copolymers thereof--see, for example, U.S. Pat. Nos. 3,773,919 and 3,887,699; Jackanicz et al., Contraception, 1973, 8, 22
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