String theory and quantum gravity'91:  proceedings of the Trieste Spring School & Workshop ICTP, Trieste, Italy, April 15-26, 1991 / 
edited by J. Harvey ...(et al.). 
 - Singapore:  World Scientific,  1992. 
 - 383 p. ;   26 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>String models--Congresses<br/>Quantum gravity--Congresses