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2.
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3.
Reed, S.B., "Social and psychological factors affecting fertility: The interrelationship of marital adjustment, fertility control, and size of family", Milbank Mem. fun Quarterly, 25: 383-425, 1947.
4.
Terman, L.M., Genetic Studies of Genius, vol. 1, The Mental and physical traits of a thousand gifted children ( Stanford Univ. Press:Stanford, Calif., 1925, p. 121.)
5.
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