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Guojia Ma and  Guoqiang Lin and  Shuili Gong and  Gang Sun and  Dawang Wang,  The Influence of Substrate Bias on the Mechanical Properties of a W- and S-containing DLC-based Solid-lubricant Film.   journal   = {International Journal of Chemical, Molecular, Nuclear, Materials and Metallurgical Engineering}, [online]. World Academy of Science, Engineering and Technology. August 2012, vol. 68(8). 712 - 715[viewed 22 October 2017]. Available from: http://waset.org/publications/3529.