Balden, M., Sauter, P. A., Jong, S., Adelhelm, C., Lindig, S., Rasinski, M., et al. (2011). Carbide formation in tungsten-containing amorphous carbon films by annealing. Thin Solid Films, 519(12), 4049-4053. doi:10.1016/j.tsf.2011.01.403.