@article{Papke1996,
author = {Papke, L. E. and Wooldridge, J. M.},
title= {Econometric methods for fractional response variables with an application to 401(k) plan participation rates},
year = {1996},
doi = {10.1002/(SICI)1099-1255(199611)11:6<619::AID-JAE418>3.0.CO;2-1},
volume = {11},
pages = {619--663},
}