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\bibitem{Sels_etal2013} {\textquotedblleft}\textit{Wigner distribution functions for complex dynamical systems : a path integral approach}{\textquotedblright}. Sels D, Brosens F, Magnus W, Physica: A : theoretical and statistical physics \textbf{392}, 326 (2013).   http://doi.org/10.1016/j.physa.2012.09.007

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