Allen, Bruce Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;
prd-95-51-1546.pdf (Publisher version), 2MB
Allen, B., Casper, P., & Ottewill, A. C. (1995). Closed-form expression for the momentum radiated from cosmic string loops. Physical Review D, 51(4), 1546-1552. doi:10.1103/PhysRevD.51.1546.