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Linacre Quarterly, 14–15.

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There seems to be some evidence pointing to certain chromatic differentiation even among monozygotic twins. See: Watson J. W. , Albright S. G. , Rao K. W. , and Aylsworth A. S. , “Monozygotic Twins Discordant for Partial Trisomy 1,” Obstetrics and Gynecology 76 (1990), pp. 949–951.

Johnson , op. cit, pp. 107–109; Moore, op. cit., pp. 122-129.

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Simonds , op. cit, p. 16.

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Time, August 29, 1994, pp. 60–61; U.S. News and World Report, October 3, 1994, p. 60.

U.S. News and World Report, January 3, 1994, pp. 78–79.