@article{article1078d3ff,
title   = {Measurement error models with nonconstant covariance matrices},
author = {Arellano-Valle, Reinaldo Boris and Bolfarine, Heleno and Gasco, Loretta B.},
year = {2002},
doi = {10.1006/jmva.2001.2024},
journal   = {Journal of Multivariate Analysis}
}