Allen, Bruce Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;
prd45-4504.pdf (Publisher version), 2MB
Allen, B., Mc Laughlin, J. G., & Ottewill, A. C. (1992). Examples of the Vilkovisky-Dewitt effective action in one-loop quantum gravity. Physical Review D, 45(12), 4504-4513. doi:10.1103/PhysRevD.45.4504.