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Boucetta, M. and Lebzioui, H. (2016) Flat Nonunimodular Lorentzian Lie Algebras. Communications in Algebra, 44 (10). pp. 4185-4195.
Ben Haddou, M.A. and Boucetta, M. and Lebzioui, H. (2012) Left-Invariant lorentzian flat metrics on lie groups. Journal of Lie Theory, 22 (1). pp. 269-289.