2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/58412The mathematical relations between certain classical Non-Riemannian gravity models and Einstein-Proca theories are discussed in details. We also show some relations with theories with scalar fields.123 pages, PhD thesis, Lancaster University, UK, (1999)Mathematical PhysicsGeneral Relativity and Quantum CosmologyDifferential Geometrytext