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Ctibor Határ
PhD. Department of Pedagogy, Faculty of Education, Constantine the Philosopher University in Nitra Dražovská 4, 949 74 Nitra, Slovakia
Soňa Grofčíková
PhD. Department of Pedagogy, Faculty of Education, Constantine the Philosopher University in Nitra Dražovská 4, 949 74 Nitra, Slovakia