Дементьева, В.И. 1977. On The Reasons of a Wider Functioning of Constructions with the Verbal Form “to be” in Russian Dialects Spoken in the North-Western Area in Comparison with the Rest of Russian Dialects. Kalbotyra. 27, 2 (Dec. 1977), 27–37. DOI:https://doi.org/10.15388/Knygotyra.1977.21792.