TWINNING AND ANENCEPHALY

[11] FIELD B, 1974, LANCET, V2, P964

[12] FREZAL J, 1964, AM J HUM GENET, V16, P336

[13] GITTELSOHN AM, 1965, PHS1163 US DEP HEW P, P305

[14] GUERRERO R, 1970, INT J FERTIL, V15, P221

[15] ASSOCIATION OF TYPE AND TIME OF INSEMINATION WITHIN MENSTRUAL-CYCLE WITH HUMAN SEX-RATIO AT BIRTH [J]. NEW ENGLAND JOURNAL OF MEDICINE, 1974, 291 (20) : 1056 - 1059

[16] HAY S, 1970, American Journal of Human Genetics, V22, P662

[17] HIILESMAA V, 1945, ACTA OBSTET GYNEC S2, V25, P27

[18] HOROWITZ I, 1969, CAN MED ASSOC J, V100, P748

[19] JAMES WH, 1971, LANCET, V1, P112

[20] SEX-RATIO AND SEX COMPOSITION OF EXISTING SIBS [J]. ANNALS OF HUMAN GENETICS, 1975, 38 (JAN) : 371 - 378

[11] FIELD B, 1974, LANCET, V2, P964

[12] FREZAL J, 1964, AM J HUM GENET, V16, P336

[13] GITTELSOHN AM, 1965, PHS1163 US DEP HEW P, P305

[14] GUERRERO R, 1970, INT J FERTIL, V15, P221

[15] ASSOCIATION OF TYPE AND TIME OF INSEMINATION WITHIN MENSTRUAL-CYCLE WITH HUMAN SEX-RATIO AT BIRTH [J]. NEW ENGLAND JOURNAL OF MEDICINE, 1974, 291 (20) : 1056 - 1059

[16] HAY S, 1970, American Journal of Human Genetics, V22, P662

[17] HIILESMAA V, 1945, ACTA OBSTET GYNEC S2, V25, P27

[18] HOROWITZ I, 1969, CAN MED ASSOC J, V100, P748

[19] JAMES WH, 1971, LANCET, V1, P112

[20] SEX-RATIO AND SEX COMPOSITION OF EXISTING SIBS [J]. ANNALS OF HUMAN GENETICS, 1975, 38 (JAN) : 371 - 378