TY  - RPRT
TI  - Modular-invariant closed-string field theory.
AU  - M Kaku
AU  - J Lykken
PY  - 1988
DO  - 10.1103/physrevd.38.3067
UR  - https://pubmed.ncbi.nlm.nih.gov/9959052/
ID  - 9959052
ER  -