@article{Bushway2007,
author = {Bushway, S. and Johnson, B.D. and Slocum, L.A.},
title= {Is the magic still there? The use of the Heckman two-step correction for selection bias in criminology},
year = {2007},
doi = {10.1007/s10940-007-9024-4},
volume = {23},
number = {2},
pages = {151--178},
}