1. Injectable Particulate Contraceptive Systems;Beck,1980
2. New Long-Acting Injectable Microcapsule Contraceptive System;Beck;Am J Obstet and Gynecol,1979
3. Evaluation of a New Three-Month Injectable Contraceptive Microsphere System in Primates (Baboon);Beck;J Contracep Del Systems,1980
4. Biodegradable microsphere contraceptive system;Beck;Acta Eur Fert,1980
5. Low doses of progestogens as an approach to fertility control;Martinez-Manautou;Fertil Steril,1966