Bull. D' Analyses ...... Bulgare Cultural Nos. 1-2,4 

 - Sofia  Acad Bulg. Des Sci  1982 
<br/><br/><label>Subjects--Topical Terms: </label><br/>S5922:N58
<br/><br/><label>Dewey Class. No.: </label>S5922:N58  / 122I8.25.2