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\bibitem{Magnus_etal2017} {\textquotedblleft}\textit{Quantum canonical ensemble : a projection operator approach}{\textquotedblright}. Magnus W, Lemmens L, Brosens F, Physica: A : theoretical and statistical physics \textbf{482}, 1 (2017).   http://doi.org/10.1016/J.PHYSA.2017.04.069

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