@article{Guilkey1993,
author = {Guilkey, D.K. and Murphy, J.L. },
title= {Estimation and testing in the random effects probit model},
year = {1993},
doi = {10.1016/0304-4076(93)90028-4},
journal = {Journal of Econometrics },
volume = {59},
number = {3},
pages = {301−317},
}