@article{Cameron1996,
author = {Cameron, A.C. and Windmeijer, F.A.G.},
title= {R-Squared measures for count data regression models with applications to health-care utilization},
year = {1996},
doi = {10.2307/1392433},
journal = {Journal of Business & Economic Statistics},
volume = {14},
number = {2},
pages = {209--220},
}