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00925njm 22002777a 4500 dc Batat, W. author Castrillón López, Marco author Rosado María,, E. author 2015-08 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. 0926-2245 10.1016/j.difgeo.2015.04.004 https://hdl.handle.net/20.500.14352/24107 http://www.sciencedirect.com/science/article/pii/S0926224515000662 http://arxiv.org/pdf/1407.3106v1.pdf http://www.sciencedirect.com/ Four-dimensional naturally reductive pseudo-Riemannian spaces