@article{article2d8556a3,
title   = {Covariance matrix formula for generalized linear models with unknown dispersion},
author = {Cordeiro, Gauss Moutinho and Barroso, Lúcia Pereira and Botter, Denise Aparecida},
year = {2006},
doi = {10.1080/03610920500439687},
journal   = {Communications in Statistics - Theory and Methods}
}