TY  - RPRT
TI  - Factorization of a two-loop four-point superstring amplitude.
AU  - O Yasuda
PY  - 1988
DO  - 10.1103/physrevlett.60.1688
UR  - https://pubmed.ncbi.nlm.nih.gov/10038114/
ID  - 10038114
ER  -