Perturbative photon fluxes generated by high-frequency gravitational waves and their physical effectsFangyu Li, R.M.L. Baker Jr., Zhenyun Fang, G.V. Stephenson and Zhenya ChenEur. Phys. J. C, 56 3 (2008) 407-423DOI: https://doi.org/10.1140/epjc/s10052-008-0656-9