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Tyler, David E.; Critchley, Frank; Dümbgen, Lutz; Oja, Hannu (2009). Invariant co-ordinate selection. Journal of the Royal Statistical Society. Series B - statistical methodology, 71(3), pp. 549-592. London: Royal Statistical Society 10.1111/j.1467-9868.2009.00706.x
Dümbgen, Lutz; Tyler, David E. (2005). On the Breakdown Properties of some Multivariate M-Functionals. Scandinavian journal of statistics, 32(2), pp. 247-264. Blackwell 10.1111/j.1467-9469.2005.00425.x
