Precision Mass Spectroscopy of the Antiproton and Proton Using Simultaneous Trapped Particles

G. Gabrielse, A. Khabbaz, D. S. Hall, C. Heimann, H. Kalinowsky and W. Jhe, ”Precision Mass Spectroscopy of the Antiproton and Proton Using Simultaneous Trapped Particles”, Phys. Rev. Lett. 82 (16), 3198-3201 (1999)