Allen, Bruce Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;
prd45-3447.pdf (Publisher version), 4MB
Allen, B., & Caldwell, R. R. (1992). Cosmological constraints on cosmic-string gravitational radiation. Physical Review D, 45(10), 3447-3468. doi:10.1103/PhysRevD.45.3447.