@article{Zhu2005,
author = {Zhu, B.P.},
title= {Effects of interpregnancy interval on birth outcomes. Findings from three recent US studies},
year = {2005},
doi = {10.1016/j.ijgo.2004.08.002},
journal = {International Journal of Gynecology and Obstetrics},
volume = {89},
number = {1},
pages = {S25--S33},
}