Bolfarine, H. & Arellano-Valle, R. B. (1994). Robust modelling in measurement error models using the t distribution. Brazilian Journal of Probability and Statistics, 8(1),

67–84.

Cheng, C.-L. & Riu, J. (2006). On estimating linear relationships when both variablesare subject to heteroscedastic measurement errors. Technometrics, 48(4), 511–519.

thanksa lot!!!