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\bibitem{deKeyser_etal1996} {\textquotedblleft}\textit{Interplay of 2D and 3D charge carriers in Si-δ-doped InSb layers grown epitaxially on GaAs}{\textquotedblright}. de Keyser A, Bogaerts R, Karavolas VC, van Bockstal L, Herlach F, Peeters FM, van de Graaf W, Borghs G, Solid state electronics \textbf{40}, 395 (1996).   http://doi.org/10.1016/0038-1101(96)84617-X

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