2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/52819The eight-vertex model at the reflectionless points is considered on the basis of Smirnov's axiomatic approach. Integral formulae for form factors of the eight-vertex model can be obtained in terms of those of the eight-vertex SOS model, by using vertex-face transformation. The resulting formulae have very simple forms at the reflectionless points, and suggests us the explicit expressions of the type II vertex operators of the eight-vertex model.13 pages, Based on a talk given in the conference `Solvable Lattice Models 2004 -- Recent Progress in Solvable Lattice Models --', RIMS, Kyoto University, 23 July 2004, submitted to RIMS KokyurokuHigh Energy Physics - TheoryMathematical PhysicsQuantum Algebratext