2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/28779This is an invited lecture at the XXII International School of Theoretical Physics, Ustron, Poland, 9/10-9/15, 1998. The boson-fermion model of high T_C superconductivity is reviewed. Its applications to the pseudo-gap and DC transport coefficients are discussed.14 pages, 3 figures; A few changes in the quotationsStrongly Correlated Electronstext