@techreport{Martin2002,
author = {Martin, J.A. and Hamilton, B.E. and Ventura, S.J. and Menacker, F. and Park, M.M},
title= {Births: Final data for 2001. National Vital Statistics Reports (vol 51, no. 5)},
year = {2002},
publisher = {National Center for Health Statistics},
address = {Hyattsville, MD},
}