Опит за изучаване на първобългарските следи в българския и карачаево-балкарския език

o far Bulgarian linguistics has looked for traces of Proto-Bulgarian primarily in the Čuvaš language as a mediator. The authors of the paper abandon this approach and investigate the linguistic and historical connection between Bulgarian and the Balkar-Karačaev language. As a result of that novel approach a number of new words, both from the onomastic and non-onomastic classes have been added to the established Proto-Bulgarian ones: bălgarin băalkăar, măalkăar, kopanec, čeren tatarin, čavka, tajče, Tangra-Tejri, Atila, Asparuh, Šibil, Kospartov and Šabla. It was found that for the purposes of defining more accurately the Proto-Bulgarian lexical layer, the Karačaevo-Balkar language offers a number of advantages as compared to Čuvaš. Evidence was also found to substantiate the claim that the Karačaevo-Balkar language is the most suitable mediator for studies of the Rumanian substratum of the Bulgarian language.