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\bibitem{Lok_etal1996} {\textquotedblleft}\textit{Resonant tunneling through D$^{-}$ states}{\textquotedblright}. Lok JGS, Geim AK, Maan JC, Marmorkos I, Peeters FM, Mori N, Eaves L, McDonnell P, Henini M, Sakai JW, Main PC, Surface science : a journal devoted to the physics and chemistry of interfaces \textbf{361/362}, 247 (1996)

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