1. Need for acceptability of long-acting steroida) contraception;Shain,1984
2. Technologie pharmaceutique et contraception;Duchêne;Sci. Techn. Prat. Pharma,1986
3. Polymeric controlled drug delivery;Leong;Adv. Drug Del. Rev.,1987
4. Controlled release systems for contraception;Nash,1986
5. Controlled-release contraceptive devices;Sam,1990