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Analysis and Mathematical Physics > 2019 > 9 > 2 > 829-837
Complex Analysis and Operator Theory > 2019 > 13 > 2 > 321-340
Journal of Mathematical Analysis and Applications > 2017 > 452 > 2 > 871-882
Analysis and Mathematical Physics > 2019 > 9 > 2 > 829-837
Complex Analysis and Operator Theory > 2019 > 13 > 2 > 321-340
Journal of Mathematical Analysis and Applications > 2017 > 452 > 2 > 871-882