Progress in Mathematical Relativity, Gravitation and Cosmology Proceedings of the Spanish Relativity Meeting ERE2012, University of Minho, Guimarães, Portugal, September 3-7, 2012 / / edited by Alfonso García-Parrado, Filipe C. Mena, Filipe Moura, Estelita Vaz. // Springer eBooks. URL: http://dx.doi.org/10.1007/978-3-642-40157-2