Keitel, Christoph H. Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;
http://iopscience.iop.org/0295-5075/47/3/318/ (Publisher version)
Hu, S., & Keitel, C. H. (1999). Hollowing out single ions with high-power lasers. Europhysics Letters, 47(3), 318-323. doi:10.1209/epl/i1999-00391-2.