Verhoeven, J., Zeijlemaker, H., Puik, E. J., & van der Wiel, M. J. (1990). On the Use of H+ and Ar+ Ions for High Spatial-Resolution Depth Profiling. Vacuum, 41, 1327-1329. https://doi.org/10.1016/0042-207x(90)93948-i (Original work published 1990)
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