Keitel, Christoph H. Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;
http://iopscience.iop.org/0953-4075/29/16/001/ (Publisher version)
Protopapas, M., Keitel, C. H., & Knight, P. L. (1996). Relativistic mass shift effects in adiabatic intense laser field stabilization of atoms. Journal of Physics B: Atomic, Molecular and Optical Physics, 29(16), L591-L598. doi:10.1088/0953-4075/29/16/001.