adverb
Viktor S. Xrakovskij. A semantic and contrastive analysis of the phrases kak možno lučše and kak nelʹzja lučše
RJANO. 2021. № 2 (42), Pages. 65 - 82
Sofia K. Pozharitskaya, Nadezhda L. Samsonova. Remarks on the structure and semantics of adverbs in one dialectal system (v. Deulino, Ryazan’ region)
RJANO. 2013. № 1 (25), Pages. 111 - 134