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\bibitem{Kocabas_etal2021} {\textquotedblleft}\textit{First-principles discovery of stable two-dimensional materials with high-level piezoelectric response}{\textquotedblright}. Kocabas T, Cakir D, Sevik C, Journal Of Physics-Condensed Matter \textbf{33}, 115705 (2021).   http://doi.org/10.1088/1361-648X/ABD3DA

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