Szucs, S., Karemera, M., Terao, M., & Brouillard, F. (1984). Experimental-study of the Mutual Neutralization of H+ and H- Between 5-ev and 2000-ev. Journal of Physics B: Atomic, Molecular and Optical Physics, 17(8), 1613-1622. https://doi.org/10.1088/0022-3700/17/8/021 (Original work published 1984)