Allen, Bruce Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;
prd35-3771.pdf (Publisher version), 939KB
Allen, B., & Folacci, A. (1987). Massless minimally coupled scalar field in de Sitter space. Physical Review D, 35(12), 3771-3778. doi:10.1103/PhysRevD.35.3771.