Nicolai, Hermann Quantum Gravity & Unified Theories, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;
346839.pdf (Verlagsversion), 2MB
Korotkin, D. A., & Nicolai, H. (1994). The ernst equation on a riemann surface. Nuclear Physics B, 429(1), 229-254. doi:10.1016/S0550-3213(94)80048-0.