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Maronna et al. (2019) Maronna, Ricardo A.; Martin, R. Douglas; Yohai, Victor J.; Salibián-Barrera, Matías (2019) [2006], Robust statistics: Theory and methods (with R), Wiley Series in Probability and Statistics (2nd ed.), Chichester: John Wiley & Sons, Ltd., doi:10.1002/9781119214656, ISBN978-1-119-21468-7.