Bull. D'analyses De La Litter Scient Bulgare: Nos. 1-2 

 - Sofia  Academie Bulgare....  1970 
<br/><br/><label>Subjects--Topical Terms: </label><br/>55922:N58
<br/><br/><label>Dewey Class. No.: </label>55922:N58  / 122I8.13.1