Bull. D' Analyses ...... Bulgare:Arts et culture. vol.23:1979-80 

 - Sofia  Acad Bulg. Des Sci  1980 
<br/><br/><label>Subjects--Topical Terms: </label><br/>55922:N58
<br/><br/><label>Dewey Class. No.: </label>55922:N58  / 122 I8.23