VNUKOVICH, Y. (2025). ETHNIC IDENTIFICATION OF BELARUSIANS AND LITHUANIANS BASED ON THE "SPEECH SAMPLES" COLLECTED BY P.I. KÖPPEN IN 1827. Vestnik of Polotsk State University. Part A. Humanities, (3), 84-99. https://doi.org/10.52928/2070-1608-2025-75-3-84-99