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\bibitem{Kao_etal2014} {\textquotedblleft}\textit{Tensile strained Ge tunnel field-effect transistors: k\cdot p material modeling and numerical device simulation}{\textquotedblright}. Kao K-H, Verhulst AS, Van de Put M, Vandenberghe WG, Sor{\'e}e B, Magnus W, De Meyer K, Journal of applied physics \textbf{115}, 044505 (2014).   http://doi.org/10.1063/1.4862806

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