Letuchiy Alexander B. «The place of the predicative in the system of Russian attributive words (adverbials and adjectives)» // Tomsk State University Journal of Philology 2022. №76 C.105-147
Maltseva A. A. «Aspects of the use of predicative morphemes with a dropping vowel in the Koryak and Alutor languages» // Siberian Journal of Philology 2018. №2 C.227-243
