В. И. Дементьева, “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”, KLB, vol. 27, no. 2, pp. 27–37, Dec. 1977, doi: 10.15388/Knygotyra.1977.21792.