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1von: Piatek, Bozena
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2von: Mohammad S. Khan2017, in: Sultan Qaboos University Journal for Science
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9von: Górnicki, Jarosław
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17von: Domínguez Benavides, T.
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19von: Arunchai Areerat2011, in: Journal of Inequalities and Applications
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20von: Nashine, Hemant Kumar