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\bibitem{Symons_etal1998} {\textquotedblleft}\textit{Theory of the band mixing induced negative magnetoresistance in broken gap superlattices}{\textquotedblright}. Symons DM, Peeters FM, Lakrimi M, Khym S, Portal JC, Mason NJ, Nicholas RJ, Walker PJ, Physica. E: Low-dimensional systems and nanostructures \textbf{2}, 353 (1998).   http://doi.org/10.1016/S1386-9477(98)00074-5

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