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Journal of Mathematical Analysis and Applications > 2007 > 329 > 1 > 655-663
Acta Mathematica Sinica, English Series > 2007 > 23 > 10 > 1745-1750
Journal of Functional Analysis > 1999 > 167 > 2 > 243-344
Journal of Mathematical Analysis and Applications > 2007 > 329 > 1 > 655-663
Acta Mathematica Sinica, English Series > 2007 > 23 > 10 > 1745-1750
Journal of Functional Analysis > 1999 > 167 > 2 > 243-344