2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/137120An explicit derivation of dispersion relations and spectra for periodic Schrödinger operators on carbon nano-structures (including graphen and all types of single-wall nano-tubes) is provided.25 pages, 7 figuresMathematical Physics92E10, 05C90, 58J50, 58J90, 81V99, 94C15text