Group Theoretical Methods in Physics. Sixth International Colloquium Tubingen 1977 / 
Ed.by Kramer P. 
 - Berlin :  Springer,  1978. 
 - XVIII,546 s.,bibliogr. ;  24 cm. 
<br/><br/> ISSN 134 ; 79. 
<br/><br/><label>ISSN: </label>134 
<br/><br/><label>Universal Decimal Class. No.: </label>519.4(061.3)  53(061.3)