Keitel, Christoph H. Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;
http://iopscience.iop.org/0034-4885/60/4/001/ (Publisher version)
Protopapas, M., Keitel, C. H., & Knight, P. L. (1997). Atomic physics with super-high intensity lasers. Reports on Progress in Physics, 60(4), 389-486. doi:10.1088/0034-4885/60/4/001.