RT Journal Article T1 Four-dimensional naturally reductive pseudo-Riemannian spaces A1 Batat, W. A1 Castrillón López, Marco A1 Rosado María, , E. AB The classification of 4-dimensional naturally reductive pseudo-Riemannian spaces is given. This classification comprises symmetric spaces, the product of 3-dimensional naturally reductive spaces with the real line and new families of indecomposable manifolds which are studied at the end of the article. The oscillator group is also analyzed from the point of view of this classification. PB Elsevier Science SN 0926-2245 YR 2015 FD 2015-08 LK https://hdl.handle.net/20.500.14352/24107 UL https://hdl.handle.net/20.500.14352/24107 LA eng NO MICINN, Spain DS Docta Complutense RD 17 abr 2025