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Statistics and Probability Letters > 2012 > 82 > 4 > 843-851
Journal of Multivariate Analysis > 2010 > 101 > 7 > 1681-1700
Journal of Multivariate Analysis > 2002 > 82 > 1 > 166-188
Computational Statistics and Data Analysis > 1997 > 25 > 2 > 159-166