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\bibitem{Szafran_etal2009} {\textquotedblleft}\textit{Violation of Onsager symmetry for a ballistic channel Coulomb coupled to a quantum ring}{\textquotedblright}. Szafran B, Poniedzia{\l}ek MR, Peeters FM, Europhysics letters \textbf{87}, 47002 (2009).   http://doi.org/10.1209/0295-5075/87/47002

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