Theisen, Stefan Quantum Gravity & Unified Theories, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;
TMP95-1993.pdf (Any fulltext), 2MB
Klemm, A., & Theisen, S. (1993). Recent efforts in the computation of string couplings. Theoretical and Mathematical Physics, 95(2), 583-594. doi:10.1007/BF01017144.