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\bibitem{Hilber_etal1996} {\textquotedblleft}\textit{Impurity band and magnetic-field-induced metal-insulator transition in a doped GaAs/AlxGa1-xAs superlattice}{\textquotedblright}. Hilber W, Helm M, Peeters FM, Alavi K, Pathak RN, Physical review : B : condensed matter and materials physics \textbf{53}, 6919 (1996).   http://doi.org/10.1103/PhysRevB.53.6919

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