@article {li1996m, title = {M-estimates of regression when the scale is unknown and the error distribution is possibly asymmetric: A minimax result}, journal = {The Canadian Journal of Statistics/La Revue Canadienne de Statistique}, year = {1996}, pages = {193{\textendash}206}, publisher = {JSTOR}, author = {Li, Bing and Zamar, Ruben H} }