Petrosyan, Vardan. “Diachronic and Achronic Nature of Old Armenian Diphthongoids Deriving from IE Diphthongal System”. Bulletin of Yerevan University B: Philology, vol. 14, no. 3 (42), Nov. 2023, pp. 39-48, doi:10.46991/BYSU:B/2023.14.3.039.