Alvarez-Gaume, L, et al. <br/><br/>
Superstrings 87: Proceedings of the trieste spring school 1-11 april 1987 

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 - World Scientific Publishing Co Pte Ltd., Singapore  1987 
 - 422 
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<br/><br/><label>ISBN: </label>  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Theoretical physics
<br/><br/><label>Dewey Class. No.: </label>530.1  ALV-S