Superstring construction/ 
editor Bert Schellekens. 
 - Amsterdam:  North-Holland,  1989. 
 - 514 pages:   illustrations;   27 cm. 
 - Current physics  4 .
<br/><br/>p. 511-514 
<br/><br/><label>ISBN: </label>0444874925 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Superstring theories