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\bibitem{Sels_etal2012} {\textquotedblleft}\textit{On the path integral representation of the Wigner function and the BarkerMurray ansatz}{\textquotedblright}. Sels D, Brosens F, Magnus W, Physics letters : A \textbf{376}, 809 (2012).   http://doi.org/10.1016/j.physleta.2012.01.020

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