Special Relativity and the Single Antiproton: Forty-Fold Improved Comparison of and p Charge-To-Mass Ratios

G. Gabrielse, D. Phillips, W. Quint, H. Kalinowsky, G. Rouleau and W. Jhe, ”Special Relativity and the Single Antiproton: Forty-Fold Improved Comparison of and p Charge-To-Mass Ratios”, Phys. Rev. Lett. 74 (18), 3544-3547 (1995)