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Holovkova, Tetiana and Onul, Nataliа (2022) Application of psychohygienic measures to optimize learning conditions. PNAP = Periodyk Naukowy Akademii Polonijnej = Scientific Journal of Poloniyna Academy, 50 (1). pp. 242-247. ISSN 1895-9911 (Print), 2543-8204 (Online)