@article{Martin2015,
author = {Martin, J.A. and Hamilton, B.E. and Osterman, M.J. and Curtin, S.C. and Matthews, T.J.},
title= {Births: Final data for 2013},
year = {2015},
journal = {National Vital Statistics Report},
volume = {64},
number = {1},
pages = {1--65},
}