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\bibitem{Baskurt_etal2020} {\textquotedblleft}\textit{Stable single-layers of calcium halides (CaX$_{2}$, X = F, Cl, Br, I)}{\textquotedblright}. Baskurt M, Yagmurcukardes M, Peeters FM, Sahin H, Journal Of Chemical Physics \textbf{152}, 164116 (2020).   http://doi.org/10.1063/5.0006011

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