2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/54473We review characteristic features of N=2 supersymmetric vector multiplets and discuss symplectic reparametrizations and their relevance for monopoles and dyons. We close with an analysis of perturbative corrections to the low-energy effective action of N=2 heterotic superstring vacua.LateX file, 12 pp. To appear in the proc. of the Workshop on Strings, Gravity & Related Phenomena, Trieste, 1995High Energy Physics - Theorytext