@techreport{Fitzenberger2013,
author = {Fitzenberger, B. and Sommerfeld, K. and Steffes, S:},
title= {Causal effects on employment after first birth: A dynamic treatment approach},
year = {2013},
publisher = {IZA Institute of Labor Economics},
address = {Bonn},
number = {IZA discussion paper no. 7438},
}