@article{articlef353d4eb,
title   = {Second-Order Covariance Matrix Formula for Heteroskedastic Generalized Linear Models},
author = {Barroso, Lucia Pereira and Botter, Denise Aparecida and Cordeiro, Gauss Moutinho},
year = {2013},
doi = {10.1080/03610926.2011.594543},
journal   = {Communications in Statistics - Theory and Methods}
}