Klára Jágrová, 
   Irina Stenger, 
   Roland Marti and 
   Tania Avgustinova. Lexical and Orthographic Distances between Czech, Polish, Russian, and Bulgarian - a Comparative Analysis of the Most Frequent Nouns.  In Language  Use  and  Linguistic Structure.  Olomouc  Modern  Language  Series, Pages 401-416, Palacký University Olomouc,   2017.      google Note: C4.
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