TY  - BOOK
AU  - Green, M. 
AU  - Iengo, R.
TI  - Superstrings' 89: Proceedings of the trieste spring school 3-14 April  1989
SN  - 9789810201388
U1  - 530.1 
PY  - 1990///
CY  - Singapore
PB  - World Scientific 
KW  - Physics
N2  - 2001-08-15
ER  -