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Journal of Contemporary Mathematical Analysis (Armenian Academy of Sciences) > 2018 > 53 > 1 > 56-60
Acta Mathematica Hungarica > 2016 > 148 > 2 > 370-385
Advances in Mathematics > 2015 > 285 > C > 434-453
Czechoslovak Mathematical Journal > 2006 > 56 > 2 > 559-578
Journal of Mathematical Analysis and Applications > 2000 > 250 > 2 > 533-547