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\bibitem{Mihailescu_etal1999} {\textquotedblleft}\textit{Crystalline structure of very hard tungsten carbide thin films obtained by reactive pulsed laser deposition}{\textquotedblright}. Mihailescu IN, Gyorgy E, Marin G, Popescu M, Teodorescu VS, van Landuyt J, Grivas C, Hatziapostolou A, Journal of vacuum science and technology: A: vacuum surfaces and films \textbf{17}, 249 (1999).   http://doi.org/10.1116/1.581579

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