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\bibitem{VandeVelde_etal2007} {\textquotedblleft}\textit{From anisole to 1,2,4,5-tetramethoxybenzene: theoretical study of the factors that determine the conformation of methoxy groups on a benzene ring}{\textquotedblright}. Vande Velde C, Bultinck E, Tersago K, van Alsenoy C, Blockhuys F, International journal of quantum chemistry \textbf{107}, 670 (2007).   http://doi.org/10.1002/qua.21183

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