Jentschura, Ulrich David Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;
Jentschura, U. D., & Mohr, P. J. (2005). Calculation of hydrogenic Bethe logarithms for Rydberg states. Physical Review A, 72(1): 012110. doi:10.1103/PhysRevA.72.012110.