Попко, О. В ; Popko, O. V http://ep3.nuwm.edu.ua/17883/1/%D0%9F%D1%80%D0%BE%D0%BC%D0%B8%D1%81%D0%BB%D0%BE%D0%B2%D0%B8%D0%B9%20%D0%BC%D0%B0%D1%80%D0%BA%D0%B5%D1%82%D0%B8%D0%BD%D0%B3.pdf.
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Попко, О. В ; Popko, O. V http://ep3.nuwm.edu.ua/13277/1/%D0%9E%D0%9F%D0%98%D0%A1%20%D0%94%D0%98%D0%A1%D0%A6%D0%98%D0%9F%D0%9B%D0%86%D0%9D%D0%98%20%20%D0%9F%D1%80%D0%BE%D0%BC%D0%B8%D1%81%D0%BB%D0%BE%D0%B2%D0%B8%D0%B9%20%D0%BC%D0%B0%D1%80%D0%BA%D0%B5%D1%82%D0%B8%D0%BD%D0%B3,%20%202018%20%282%29.pdf.
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2019
Попко, О. В ; Popko, O. V http://ep3.nuwm.edu.ua/16059/1/%D0%9F%D1%80%D0%BE%D0%BC%D0%B8%D1%81%D0%BB%D0%BE%D0%B2%D0%B8%D0%B9%20%D0%BC%D0%B0%D1%80%D0%BA%D0%B5%D1%82%D0%B8%D0%BD%D0%B3.pdf.
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