Nicolai, Hermann Quantum Gravity & Unified Theories, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;
354784.pdf (Publisher version), 363KB
Drabant, B., Nicolai, H., & Töx, M. (1989). Yet more versions of d=11 supergravity. Classical and Quantum Gravity, 6(3), 255-262. doi:10.1088/0264-9381/6/3/007.