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\bibitem{Govaerts_etal2013} {\textquotedblleft}\textit{van der Waals bonding and the quasiparticle band structure of SnO from first principles}{\textquotedblright}. Govaerts K, Saniz R, Partoens B, Lamoen D, Physical review : B : condensed matter and materials physics \textbf{87}, 235210 (2013).   http://doi.org/10.1103/PhysRevB.87.235210

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