Keitel, Christoph H. Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;
http://link.aps.org/doi/10.1103/PhysRevA.52.525 (Verlagsversion)
Gauthey, F. I., Keitel, C. H., Knight, P. L., & Maquet, A. (1995). Role of initial coherence in the generation of harmonics and sidebands from a strongly driven two-level atom. Physical Review. A, 52(1), 525-540. doi:10.1103/PhysRevA.52.525.