2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/28298As a prelude to what might be expected as forthcoming breakthroughs in finding new approaches toward solving three-dimensional lattice models in the twenty-first century, we review the exact solutions of two lattice models in three dimensions obtained using the conventional combinatorial and transfer matrix approaches.Latex file, 16 pages, 3 figs, to be published in "Festshrift: Statistical physics on the eve of the 21st century"Statistical Mechanicstext