2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/54228The spectrum of $H$-monopoles of the heterotic string compactified on a six torus and its relationship to the $S$-duality conjecture is briefly reviewed. It is based on work done in collaboration with J. Harvey and is a contribution to the proceedings of Strings '95, USC, March 1995.2pages, Plain Tex and vanilla.styHigh Energy Physics - Theorytext