Bilousenko P. I., and Boyko L. P. “Bilousenko P. I. , Boyko L. P. Word Forming Types of Pluralia Tantum Nouns in the Old Russianukrainian Language of XI-XIII Centuries”. Philological Treatises, vol. 9, no. 2, Mar. 2020, pp. 13-19, https://tractatus.sumdu.edu.ua/index.php/journal/article/view/161.