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Lancet. 1972 Oct 14;2(7781):813-6. doi: 10.1016/s0140-6736(72)92164-2.
A trial of the ovulation method of family planning in Tonga.
Weissmann MC, Foliaki L, Billings EL, Billings JJ
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Lancet. 1972 Oct 14;2(7781):813-6. doi: 10.1016/s0140-6736(72)92164-2.
Weissmann MC, Foliaki L, Billings EL, Billings JJ