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D. Ferraro, A. Feller, A. Ghibaudo, E. Thibierge, E. Bocquillon, G. Fève, Ch. Grenier, and P. Degiovanni:Wigner function approach to single electron coherence in quantum Hall edge channels; Phys. Rev. B 88, 205303, 2013. doi: 10.1103/PhysRevB.88.205303