Purkuncoro, A. E., Soenoko, R., Santjojo, D. J. D. H. and Irawan, Y. S. (2020) “The effect of LFG plasma sputtering power on hardness of carbon thin films on SKD11 steel using target material from battery carbon rods”, Eastern-European Journal of Enterprise Technologies, 2(12 (104), pp. 24–29. doi: 10.15587/1729-4061.2020.198474.