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A la memoire de Lamberto Cattabriga
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Vaillant, J. Symétrie des opérateurs fortement hyperboliques 4×4 ayant un point triple caractéristique dansR 3 . Ann. Univ. Ferrara 45, 339–363 (1999). https://doi.org/10.1007/BF02826104
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DOI: https://doi.org/10.1007/BF02826104