@article{Wooldridge2005,
author = {Wooldridge, J.M.},
title= {Simple solutions to the initial conditions problem in dynamic nonlinear panel data models with unobserved heterogeneity},
year = {2005},
doi = {10.1002/jae.770},
journal = {Journal of Applied Econometrics},
volume = {20},
number = {1},
pages = {39--54},
}