Keitel, Christoph H. Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;
http://www.ingentaconnect.com/content/tandf/tcph/2001/00000042/00000006/art00002 (Publisher version)
Keitel, C. H. (2001). Relativistic quantum optics. Contemporary Physics, 42(6), 353-363.