Bibliography of publications of the academy of sciences of the USSR:   A year book 

 - Leningrad:   The Academy of Sciences,   1957 
 - 342p. 
<br/><br/> Vol. 1 Publications for the year 1956 
<br/><br/><label>Universal Decimal Class. No.: </label>R 017.1:5/6(47AS)=82