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\bibitem{Lok_etal1996} {\textquotedblleft}\textit{Resonant tunnelling through \textbf{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
T2 -- 11th International Conference on the Electronic Properties of 2-Dimensional Systems (EP2DS XI), August 07-11, 1995, Univ. Nottingham, Nottingham, England \textbf{362}, 247 (1996).   http://doi.org/10.1016/0039-6028(96)00395-0

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