V. Reutrakul, R. Sangsawan, S. Baravarian, R. S. Swerdloff, A. P. Sinha Hikim, Yanhe Lue, C. Wang, A. Leung, S. Chaichana,
Triptolide: a potential male contraceptive. Journal of Andrology. ,vol. 19, pp. 479- 486 ,(1998) ,
10.1002/J.1939-4640.1998.TB02042.X