2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/27423This talk reviews some recent progresses in the studies of low dimensional electronic models of strong correlations.Latex, invited talk, appearing in Proceedings of STATPHY19 (World Scientific), satellite meeting of integrable systems in quantum field theory and condensed matter physics; Nankai Institute of Mathematics, Tianjin, China, 1995Condensed Mattertext