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Ugwu, Ikechukwu P., University of Silesia in Katowice (Poland)
Ujazdowski, Kazimierz Michał, University of Lodz (Poland)
Uruszczak, Wacław, Jagiellonian University (Poland)
Ushkarenko, Iuliia, Kherson State University (Ukraine)
Uziak, Waldemar (Poland)
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ISSN: 1731-6375