Adelhelm, C., Balden, M., Rasinski, M., Lindig, S., Plocinski, T., Welter, E., et al. (2011). Investigation of metal distribution and carbide crystallite formation in metal-doped carbon films (a-C:Me, Me = Ti, V, Zr, W) with low metal content. Surface and Coatings Technology, 205(19), 4335-4342. doi:10.1016/j.surfcoat.2011.02.034.