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Amores Lázaro, Ángel Miguel and Gutiérrez, M (1992) Singularities of invariant connections. General relativity and gravitation, 24 (12). pp. 1235-1253. ISSN 0001-7701
Amores Lázaro, Ángel Miguel and Gutiérrez, M (1999) The b-completion of the Friedmann space. Journal of geometry and physics, 29 (01-feb). pp. 177-197. ISSN 0393-0440