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\bibitem{Aierken_etal2015} {\textquotedblleft}\textit{Portlandite crystal : bulk, bilayer, and monolayer structures}{\textquotedblright}. Aierken Y, Sahin H, Iyikanat F, Horzum S, Suslu A, Chen B, Senger RT, Tongay S, Peeters FM, Physical review : B : condensed matter and materials physics \textbf{91}, 245413 (2015).   http://doi.org/10.1103/PhysRevB.91.245413

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