Nicolai, Hermann Quantum Gravity & Unified Theories, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;
354340.pdf (Publisher version), 405KB
Nicolai, H. (1977). Extensions of supersymmetric spin systems. Journal of Physics A, 10(12), 2143-2151. doi:10.1088/0305-4470/10/12/022.