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Hoffmann, B., Baumann, H., Rauch, F., & Bethge, K. (1987). Ion implantation of Ti into Fe in the presence of residual and backfilled gases. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 28(3), 336–343. doi:10.1016/0168-583x(87)90173-x 
10.1016/0168-583x(87)90173-x