2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/27707The electron spectrum in the normal phase of cuprates is analyzed in terms of the boson-fermion model. It is argued that the existence of the uncondensed pairs and the quasi-two-dimensional nature of the crystal structure are responsible for the pseudo-gap above T_C observed recently.19 pages, Plain TeXCondensed Mattertext