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\bibitem{Titantah_etal2004} {\textquotedblleft}\textit{Density functional theory calculations of energy-loss carbon near-edge spectra of small diameter armchair and zigzag nanotubes: core-hole, curvature, and momentum-transfer orientation effects}{\textquotedblright}. Titantah JT, Jorissen K, Lamoen D, Physical review : B : condensed matter and materials physics \textbf{69}, 125406 (2004).   http://doi.org/10.1103/PhysRevB.69.125406

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