@article{Levin2002,
author = {Levin, M.L. and Xu, X. and Bartkowski, J.P.},
title= {Seasonality of sexual debut},
year = {2002},
doi = {10.1111/j.1741-3737.2002.00871.x},
volume = {64},
number = {4},
pages = {871--884},
}