By Author

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  • Dvureˇcenskij, A. [1] Mathematical Institute, Slovak Academy of Sciences, Stef´anikova 49, SK-814 73 Bratislava, Slovakia ˇ and Palack´y University Olomouc, Faculty of Sciences, tˇr. 17. listopadu 12, CZ-771 46 Olomouc, Czech Republic

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  • Jun, Young Bae [2] Department of Mathematics Education, Gyeongsang National University, Jinju 52828, Korea

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  • Vougiouklis, T. [1] Emeritus Professor of Mathematics, Democritus University of Thrace, Greece

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