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\bibitem{Caroca_etal2013} Caroca, R., Kondrashuk, I., Merino, N., \& Nadal, F. (2013). Bianchi spaces and their three-dimensional isometries as S-expansions of two-dimensional isometries. \textit{J. Phys. A}, \textit{46}(22), 225201--24pp.

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