Pardanaud, C., Martin, C., Roubin, P., Giacometti, G., Hopf, C., Schwarz-Selinger, T., et al. (2013). Raman spectroscopy investigation of the H content of heated hard amorphous carbon layers. Diamond and Related Materials, 34, 100-104. doi:10.1016/j.diamond.2013.02.009.