@article {yohai1997optimal,
	title = {Optimal locally robust M-estimates of regression},
	journal = {Journal of Statistical Planning and Inference},
	volume = {64},
	number = {2},
	year = {1997},
	pages = {309{\textendash}323},
	publisher = {Elsevier},
	author = {Yohai, V{\'\i}ctor J and Zamar, Ruben H}
}
