1. Caspary W. and Borutta H. (1987). “Robust estimation in deformation models.” Survey Rev. 29 29–45.
2. Caspary W. and Haen W. (1990). “Simultaneous estimation of location and scale parameters in the context of robust M-estimation.” manuscr.geod. 15 273–282.
3. Gui Q. M. (1997). “A new class of biased estimators in free net adjustment model.” Geomatics Res. Australasia 66 27–46.
4. Gui Q. M. and Dong X. R. (1993). “A class of biased estimators for LN estimation problem.” manuscr.geod. 18 1–9.
5. Gui Q. M. Huang W. B. Zhang J. J. and Yi W. Y. (1997). “A class of biased estimators of parameters in rank-deficient Gauss-Markov model.” Acta Geodaetica et Cartographica Sinica 26 261–267.