@article{Buckles2012,
author = {Buckles, K.S. and Munnich, E.L.},
title= {Birth spacing and sibling outcomes},
year = {2012},
doi = {10.1353/jhr.2012.0019},
journal = {Journal of Human Resources},
volume = {47},
number = {3},
pages = {613--642},
}