1. Huber, P. J., Robust regression, Ann. Statist., 1973, 1: 799–821.
2. Huber, P. J., Robust Statistics, New York: John Wiley, 1981.
3. Bai, Z. D., Rao, C. R, Wu, Y., M-estimation of multivariate linear regression parameters under a convex discrepancy function, Statistica Sinica, 1992, 2:237–254.
4. Rao, C. R., Toutenburg, H., Linear Models, Least Squares and Alternatives, New York: Springer-Verlag, 1995.
5. Chen, X. R., Zhao, L. C., M-Methods in Linear Model, Shanghai: Shanghai Scientific & Technical Publishers (in Chinese), 1996.