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http://journals.cambridge.org/action/displayAbstract?aid=517248
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IRIT SINAI
and MARCOS ARÉVALO
(2006).
IT’S ALL IN THE TIMING: COITAL FREQUENCY AND FERTILITY AWARENESS-BASED METHODS OF FAMILY PLANNING. Journal of Biosocial Science, 38
,
pp 763-777
doi:10.1017/S0021932005027227