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Acta Mathematica Sinica, English Series > 2009 > 25 > 11 > 1907-1920
Journal of Multivariate Analysis > 2007 > 98 > 6 > 1180-1194
Acta Mathematica Sinica, English Series > 2009 > 25 > 11 > 1907-1920
Journal of Multivariate Analysis > 2007 > 98 > 6 > 1180-1194