Scatton, Earnest. A. 1993. Bulgarian. The Slavonic Languages, ed. by Bernard Comrie and Grenville G. Corbett, 188-248. London:, New York: Routledge.
This map shows the division between east and west Bulgarian dialects. It shows a broader picture of the Bulgarian dialect situation. A previous generation of speakers is represented here; the informants were of around 50-60 years of age and the data was collected between 1964 and 1981. The dividing line shown may be known as the 'Yat border', since it separates the Eastern and Western dialects depending on which variant of the Old Bulgarian 'yat' form is used.
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