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\bibitem{Sreepal_etal2019} {\textquotedblleft}\textit{Two-dimensional covalent crystals by chemical conversion of thin van der Waals materials}{\textquotedblright}. Sreepal V, Yagmurcukardes M, Vasu KS, Kelly DJ, Taylor SFR, Kravets VG, Kudrynskyi Z, Kovalyuk ZD, Patane A, Grigorenko AN, Haigh SJ, Hardacre C, Eaves L, Sahin H, Geim AK, Peeters FM, Nair RR, Nano letters \textbf{19}, 6475 (2019).   http://doi.org/10.1021/ACS.NANOLETT.9B02700

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