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Almeida, D. P.; de Castro Faria, N. V.; Freire, F. L.; Kirsch, R.; de Pinho, A. G. . (1988). Equilibrium negative-charge fractions in swift proton beams emerging from freshly evaporated metal films. Physical Review B, 37(13), 7182–7188. doi:10.1103/PhysRevB.37.7182 
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