@ARTICLE{PangYu:MEstimator,
  AUTHOR =       "J. S. Pang and T. P.-Y. Yu",
  TITLE =        "Continuous {M}-Estimators and their Interpolation by polynomials",
  JOURNAL =      "SIAM Journal on Numerical Analysis",
  YEAR =         "2004",
  volume =        "42",
  number =       "3",
  pages =        "997 - 1017",
}