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Statistics and Probability Letters > 2012 > 82 > 4 > 843-851
Journal of Multivariate Analysis > 2010 > 101 > 7 > 1681-1700
Statistics and Probability Letters > 2012 > 82 > 4 > 843-851
Journal of Multivariate Analysis > 2010 > 101 > 7 > 1681-1700