, Ivan Franko National University of Lviv, Lviv, Ukraine (Ukraine)
, Department of Mathematics and Computer Science, Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine
, V. N. Karazin Kharkiv National University, Kharkiv, Ukraine
, Department of Mathematics, Toronto, Canada (Canada)
, Department of Electronics, National Aviation University, Kiev, Ukraine (Ukraine)
, Department of Mechanics and Mathematics, Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
, National Pedagogical Dragomanov University, Kyiv, Ukraine
, Faculty of Mathematics and Computer Science, Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine
, Department of Mathematics, Texas A&M University, College Station, TX, 77843, USA (United States)
, Department of Mathematics, Texas A&M University, College Station, USA
, Department of Mathematics and Technologies of Programming, Francisk Skorina Gomel State University, Gomel, Belarus (Belarus)
, Department of Nonlinear analysis, Institute of Mathematics NAS of Ukraine, Kyiv, Ukraine (Ukraine)
, Faculty of Mechanics and Mathematics, Ivan Franko National University of Lviv, Lviv, Ukraine
, Faculty of Mechanics and Mathematics, National University of Lviv, Lviv, Ukraine

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