M.J. Gaillard, J.-C. Poizat, A. Ratkowski, J. Remillieux, M. Auzas. Nonequilibrium effects in the proton neutral fraction emerging from solids bombarded with MeV H$^0$ H$^+$ H$_2^+$ and H$_3^+$ beams.
Physical Review A, American Physical Society, 1977, 16, pp.2323-2335.
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