"Randomised controlled trial of levonorgestrel versus the Yuzpe regimen of combined oral contraceptives for emergency contraception. Task Force on Postovulatory Methods of Fertility Regulation". Lancet. 352 (9126): 428–33. 8 August 1998. doi:10.1016/S0140-6736(98)05145-9. PMID9708750. S2CID25085328.
"Randomised controlled trial of levonorgestrel versus the Yuzpe regimen of combined oral contraceptives for emergency contraception. Task Force on Postovulatory Methods of Fertility Regulation". Lancet. 352 (9126): 428–33. 8 August 1998. doi:10.1016/S0140-6736(98)05145-9. PMID9708750. S2CID25085328.
[1]Yuzpe AA, Thurlow HJ, Ramzy I, Leyshon JI (August 1974). "Post coital contraception—A pilot study". J Reprod Med. 13 (2): 53–8. PMID4844513.
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"Randomised controlled trial of levonorgestrel versus the Yuzpe regimen of combined oral contraceptives for emergency contraception. Task Force on Postovulatory Methods of Fertility Regulation". Lancet. 352 (9126): 428–33. 8 August 1998. doi:10.1016/S0140-6736(98)05145-9. PMID9708750. S2CID25085328.