@article{Bakk2013,
author = {Bakk, Z. and Tekle, F.B. and Vermunt, J.K.},
title= {Estimating the association between latent class membership and external variables using bias-adjusted three-step approaches},
year = {2013},
doi = {10.1177/0081175012470644},
volume = {43},
number = {1},
pages = {272--311},
}