Huber, P.J. (1968) Robust Confidence Limits. Z. Wahrscheinlichkeitstheor.
Verw. Geb. 10:269--278.
Rieder, H. (1989) A finite-sample minimax regression estimator.
Statistics 20(2): 211--221.
Kohl, M. (2005) Numerical Contributions to the Asymptotic Theory of Robustness.
Bayreuth: Dissertation.
Ruckdeschel, P. and Kohl, M. (2005) How to approximate
the finite sample risk of M-estimators.