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Bulletin of the Iranian Mathematical Society 44 (2018) 1387-1404
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SIBERIAN MATHEMATICAL JOURNAL 58 (2017) 923-931
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Kyushu Journal of Mathematics 2 (2017) 257-269
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Periodica Mathematica Hungarica 73 (2016) 83-92
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Azerbaijan Journal of Mathematics 5 (2015) 54-63
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