, Pidstryhach Institute for Applied Problems of Mechanics and Mathematics National Academy of Sciences of Ukraine, Lviv, Ukraine (Ukraine)

, Department of Informative and Operating Systems and Technologies, Uzhhorod National University, Uzhhorod, Ukraine (Ukraine)
, Department of Mathematics, Toronto, Canada (Canada)
, Belarusian State University, Minsk, Belarus (Belarus)
, Department of Mathematics, Makarenko Sumy State Pedagogical University, Sumy, Ukraine (Ukraine)
, Department of Mathematics and Computer Science, Vasyl’ Stus Donetsk National University, Vinnytsya, Ukraine
, Department of mathematical analysis and differential equations, Vasyl’ Stus Donetsk National University, Vinnytsia, Ukraine
, Department of Information Protection, Vinnytsia National Technical University, Vinnytsia, Ukraine
, Department of Mathematics, Anton Makarenko Sumy State Pedagogical University, Sumy, Ukraine
, Department of Mathematics, Makarenko Sumy State Pedagogical University, Sumy, Ukraine
, National Pedagogical Dragomanov University, Kyiv, Ukraine
, Department of Mechanics and Mathematics, Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
, Institute of Mathematics, Kyiv, Ukraine

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