Keitel, Christoph H. Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;
http://www.sciencedirect.com/science/article/pii/003040189500161Z (Publisher version)
Keitel, C. H., Knight, P. L., Narducci, L. M., & Scully, M. O. (1995). Resonance fluorescence in a tailored vacuum. Optics Communications, 118(1-2), 143-153. doi:10.1016/0030-4018(95)00161-Z.