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Ishlinsky AY, Mіtrоpolskу YA, SоkоlоvYD, Lavrik VI. Pavel Feodosyevich Filchakov (on his fiftieth birthday) . Ukr. Mat. Zhurn. [Internet]. 1966Oct.27 [cited 2024Nov.24];18(6):97-101. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/8462