J.F. Bak, G. Melchart, E. Uggerhoj, J.S. Forster, P.R. Jensen, et al.. Contribution from close and distant collisions to K-shell excitation in Ge measured using the channeling technique for relativistic protons, positive and negative pions.
Physical Review A, American Physical Society, 1982, 25, pp.1334-1344.
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