Formation of the Muonic Helium Atom, , and Observation of Its Larmor Precession
P. A. Souder, D. E. Casperson, T. W. Crane, V. W. Hughes, D. C. Lu, H. Orth, H. W. Reist, M. H. Yam, and G. zu Putlitz
Phys. Rev. Lett. 34, 1417 (1975) - Published 9 June, 1975