2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/199533We review recent progress in understanding non-perturbative instanton corrections to the hypermultiplet moduli space in type II string compactifications on Calabi-Yau threefolds.7 pages, to appear in the proceedings of the European Physical Society HEP 2007 Conference, 19-25 July 2007, Manchester, EnglandHigh Energy Physics - Theorytext