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\bibitem{Surmenev_etal2020} {\textquotedblleft}\textit{Ab initio calculations and a scratch test study of RF-magnetron sputter deposited hydroxyapatite and silicon-containing hydroxyapatite coatings}{\textquotedblright}. Surmenev RA, Grubova IY, Neyts E, Teresov AD, Koval NN, Epple M, Tyurin AI, Pichugin VF, Chaikina MV, Surmeneva MA, Surfaces and interfaces \textbf{21} (2020).   http://doi.org/10.1016/J.SURFIN.2020.100727

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