TY  - RPRT
TI  - Vertex operators for closed strings.
AU  - E D'Hoker
AU  - DH Phong
PY  - 1987
DO  - 10.1103/physrevd.35.3890
UR  - https://pubmed.ncbi.nlm.nih.gov/9957651/
ID  - 9957651
ER  -