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Post-coital contraceptive activity of crude extracts of Sri Lankan marine red algae.
Ratnasooriya WD, Premakumara GA, Tillekeratne LM. Ratnasooriya WD, et al. Contraception. 1994 Sep;50(3):291-9. doi: 10.1016/0010-7824(94)90074-4. Contraception. 1994. PMID: 7805379
Sperm antimotility properties of a seed extract of Abrus precatorius.
Ratnasooriya WD, Amarasekera AS, Perera NS, Premakumara GA. Ratnasooriya WD, et al. J Ethnopharmacol. 1991 May-Jun;33(1-2):85-90. doi: 10.1016/0378-8741(91)90166-b. J Ethnopharmacol. 1991. PMID: 1943179
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