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Afrika Matematika > 2018 > 29 > 5-6 > 861-867
Aequationes mathematicae > 2015 > 89 > 3 > 771-783
Journal of Inequalities and Applications > 2013 > 2013 > 1 > 1-11
Applied Mathematics Letters > 2010 > 23 > 1 > 105-109
Nonlinear Analysis > 2009 > 71 > 12 > e1567-e1574
Opuscula Mathematica > 2008 > Vol. 28, no. 1 > 83-92
Journal of Mathematical Analysis and Applications > 2007 > 331 > 2 > 886-894