Relativity and Screening Effects in Heavy-Ion Collisions
B. Fricke, K. Rashid, P. Bertoncini, and A. C. Wahl
Phys. Rev. Lett. 34, 243 (1975) - Published 3 February, 1975
New Measurement of the Positronium Hyperfine Interval
A. P. Mills, Jr., and G. H. Bearman
Phys. Rev. Lett. 34, 246 (1975) - Published 3 February, 1975