1. Paternity rates in the US 1993–2002: Analysis of birth rates by paternal age and race 
D.H. Williams, S.A. Land, M. Han, P.D. Sutton, R.E. Brannigan 
Fertility and Sterility 
Volume 82, (September 2004)
DOI: /j.fertnstert
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2. Fertility and Sterility 2004 82, DOI: (10.1016/j.fertnstert.2004.07.056)
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3. Fertility and Sterility 2004 82, DOI: (10.1016/j.fertnstert.2004.07.056)
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