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Journal of Mathematical Analysis and Applications > 2014 > 415 > 2 > 779-790
Acta Mathematica Sinica, English Series > 2010 > 26 > 12 > 2255-2258
Journal of Mathematical Analysis and Applications > 2008 > 348 > 1 > 1-11
Integral Equations and Operator Theory > 2004 > 50 > 4 > 559-564