Karshenboim, Savely G. Laser Spectroscopy, Max Planck Institute of Quantum Optics, Max Planck Society;
Karshenboim, S. G. (2010). Precision Physics of Simple Atoms and Constraints on a Light Boson with Ultraweak Coupling. Physical Review Letters, 104(22): 220406. doi:10.1103/PhysRevLett.104.220406.