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CIMAT, A. P. 402, Guanajuato, 36000, México; Laboratoire de Topologie UMR 5584 du CNRS, U. Bourgogne, BP 400, 21011-Dijon, France. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 33, No. 1, pp. 1–13, January–March, 1999.
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Gómez-Mont, X., Mardešić, P. Index of a vector field tangent to an odd-dimensional hypersurface and the signature of the relative Hessian. Funct Anal Its Appl 33, 1–10 (1999). https://doi.org/10.1007/BF02465138
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DOI: https://doi.org/10.1007/BF02465138