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\bibitem{Gupta_etal2021} {\textquotedblleft}\textit{Hydrogen clathrates : next generation hydrogen storage materials}{\textquotedblright}. Gupta A, Baron GV, Perreault P, Lenaerts S, Ciocarlan R-G, Cool P, Mileo PGM, Rogge S, Van Speybroeck V, Watson G, Van Der Voort P, Houlleberghs M, Breynaert E, Martens J, Denayer JFM, Energy Storage Materials \textbf{41}, 69 (2021).   http://doi.org/10.1016/J.ENSM.2021.05.044

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