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Contraception. 1996 Feb;53(2):69-74. doi: 10.1016/0010-7824(95)00269-3.

Field trial of billings ovulation method of natural family planning.

Bhargava H, Bhatia JC, Ramachandran L, Rohatgi P, Sinha A

Source:

https://doi.org/10.1016/0010-7824(95)00269-3

PubMed:

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