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Popul Stud (Camb). 1977 Jul;31(2):193-217. doi: 10.1080/00324728.1977.10410427.
The role of marital sexual abstinence in determining fertility: A study of the Yoruba in Nigeria.
Caldwell JC, Caldwell P
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Popul Stud (Camb). 1977 Jul;31(2):193-217. doi: 10.1080/00324728.1977.10410427.
Caldwell JC, Caldwell P