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Mathematische Nachrichten > 292 > 11 > 2411 - 2426
Mathematical Notes > 2018 > 103 > 5-6 > 1007-1013
Applied Mathematical Modelling > 2015 > 39 > 12 > 3306-3316
Science China Mathematics > 2015 > 58 > 4 > 821-828
Journal of Inequalities and Applications > 2015 > 2015 > 1 > 1-13