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2. Biometric analysis of the multiple maternities in Finland, 1881-1990, and in Sweden since 1751. Fellman JO, Eriksson AW. Hum Biol; 1993 Jun; 65(3):463-79. PubMed ID: 8319944 [Abstract] [Full Text] [Related]
13. Maternal race/ethnicity and twinning rates in the United States, 1989-1991. Oleszczuk JJ, Cervantes A, Kiely JL, Keith DM, Keith LG. J Reprod Med; 2001 Jun; 46(6):550-7. PubMed ID: 11441679 [Abstract] [Full Text] [Related]