Bull. D'analyses......Litt. Scient. Bulgare.vol.14:1971 

 - Sopia  Acad. Ulg. Des. Sci.  1972 
<br/><br/><label>Subjects--Topical Terms: </label><br/>55922:N58
<br/><br/><label>Dewey Class. No.: </label>55922:N58  / 122 I8.14