@techreport{Ellwood2004,
author = {Ellwood, D. and Wilde, T. and Batchelder, L.},
title= {The mommy track divides: The impact of childbearing on wages of women of differing skill levels},
year = {2004},
publisher = {National Bureau of Economic Reasearch},
address = {Cambridge, MA},
number = {NBER Working Paper No. 16582},
}