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Nature 139, 841 (15 May 1937) | doi:10.1038/139841a0;

Lunar Periodicity in Homo sapiens L

DONALD L. GUNN , PENELOPE M. JENKIN & ALISTAIR L. GUNN

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We have reinvestigated these questions with data of more than 10,000 menstruations. We find a great variation in the duration of the cycle, both in one individual and between different individuals.