Keitel, Christoph H. Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;
http://www.ingentaconnect.com/content/tandf/tmop/2000/00000047/00000008/art00002 (Publisher version)
Browne, D. E., & Keitel, C. H. (2000). Resonance fluorescence in intense laser fields. Journal of Modern Optics, 47(8), 1307-1337.