@article{Hoem1990,
author = {Hoem, J.M.},
title= {Identifiability in hazard models with unobserved heterogeneity: The compatibility of two apparently contradictory results},
year = {1990},
doi = {10.1016/0040-5809(90)90030-y},
volume = {37},
number = {1},
pages = {124--128},
}