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\bibitem{Rodriguez-Alvarez_etal2011} Rodriguez-Alvarez, M. J., Sanchez, F., Soriano, A., Iborra, A., \& Mora, C. (2011). Exploiting symmetries for weight matrix design in CT imaging. \textit{Math. Comput. Model.}, \textit{54}(7-8), 1655--1664.

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