Double Slavic-Bulgar words and expressions
The language of the Asparukh and Kuber Bulgars, Vocabulary and grammar Features of the old Bulgar language, preserved in the modern Bulgarian language The Bulgar inscriptions discovered in the last decades reveal to us that some of the most characteristic features of the modern Bulgarian have their origin in the old Bulgar language. Two of the most frequent verb forms in modern Bulgarian 'E' ...
members.tripod.com/~Groznijat/b_lang/bl_double.html   reviews