Keitel, Christoph H. Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;
http://link.aps.org/doi/10.1103/PhysRevA.53.2748 (Verlagsversion)
Connerade, J.-P., & Keitel, C. H. (1996). High harmonic generation in a static magnetic field. Physical Review. A, 53(4), 2748-2751. doi:10.1103/PhysRevA.53.2748.