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\bibitem{Peeters_etal1993} {\textquotedblleft}\textit{Oscillator strength and sum rule for inter-subband transitions in a superlattice}{\textquotedblright}. Peeters FM, Matulis A, Helm M, Fromherz T, Hilber W, Physical review : B : condensed matter and materials physics \textbf{48}, 12008 (1993).   http://doi.org/10.1103/PhysRevB.48.12008

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