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\bibitem{Grubova_etal2017} {\textquotedblleft}\textit{Density functional theory study of interface interactions in hydroxyapatite/rutile composites for biomedical applications}{\textquotedblright}. Grubova IY, Surmeneva MA, Huygh S, Surmenev RA, Neyts EC, The journal of physical chemistry: C : nanomaterials and interfaces \textbf{121}, 15687 (2017).   http://doi.org/10.1021/ACS.JPCC.7B02926

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