Karshenboim, Savely G. Laser Spectroscopy, Max Planck Institute of Quantum Optics, Max Planck Society;
Karshenboim, S. G., McKeen, D., & Pospelov, M. (2014). Constraints on muon-specific dark forces. Physical Review D, 90(7): 073004. doi:10.1103/PhysRevD.90.073004.