Theisen, Stefan Quantum Gravity & Unified Theories, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;
PhLB225-1989.pdf (Publisher version), 291KB
Kapetanakis, D., Theisen, S., & Zoupanos, G. (1989). Families in the nonperturbative unification scheme. Physics Letters B, 229(3), 248-252. doi:10.1016/0370-2693(89)91166-0.