Allen, Bruce Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;
427286.pdf (Verlagsversion), 2MB
Allen, B. (1985). The SU(5) potential in desitter space. Annals of Physics, 161(1), 152-177. doi:10.1016/0003-4916(85)90340-9.