Shevchenko O. O. “Shevchenko O. O. Positional Conditionality of Functional Aktivity of Vowels in German”. Philological Treatises 4, no. 4 (May 13, 2020): 109–112. Accessed July 22, 2024. https://tractatus.sumdu.edu.ua/index.php/journal/article/view/550.