Long-acting contraceptive agents: levonorgestrel esters of unsaturated acids.
Wan AS, Ngiam TL, Leung SL, Go ML, Francisco CG, Freire R, Hernandez R, Salazar JA, Suarez E, García GA, et al.
Wan AS, et al. Among authors: suarez e.
Steroids. 1983 Mar;41(3):339-48. doi: 10.1016/0039-128x(83)90105-8.
Steroids. 1983.
PMID: 6419407