Allen, Bruce Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;
CommMathPhys106-201.pdf (Publisher version), 589KB
Allen, B., & Lütken, C. A. (1986). Spinor two-point functions in maximally symmetric spaces. Communications in Mathematical Physics, 106(2), 201-210. doi:10.1007/BF01454972.