2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/165335In a classical field model involving extended dual electromagnetic fields quark-like particles are shown to have fractional charges and a confining energy that provides an asymptotically free spherical surface. A suggestion is made for combining a measure of the confining energy with color in QCD.13 pagesHigh Energy Physics - Theorytext