Theorem on signatures
Acta Universitatis Carolinae. Mathematica et Physica, Tome 48 (2007) no. 2, pp. 55-67.

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Classification : 47H10, 54H25, 55M20, 91A22, 92D15 
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Kulpa, Władysław; Szymański, Andrzej. Theorem on signatures. Acta Universitatis Carolinae. Mathematica et Physica, Tome 48 (2007) no. 2, pp. 55-67. https://geodesic-test.mathdoc.fr/item/AUCMP_2007__48_2_a6/