2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/62888The aim of the paper is to determine left-invariant,anti-self-dual, non conformally flat, Riemannian metrics on four-dimensional Lie groups.Proc. conf. Integrable Systems in Differential Geometry, July 2000, TokyoDifferential Geometry53C26 (Primary) 53C55, 22E25 (Secondary)text