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Department of Mathematics University of Stockholm; e-mail: shaprio@matematik.su.se. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 31, No. 2, pp. 91–94, April–June, 1997.
Translated by B. Z. Shapiro
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Shapiro, B.Z. Normal forms of the whitney umbrella with respect to the contact group preserving a cone. Funct Anal Its Appl 31, 144–147 (1997). https://doi.org/10.1007/BF02466026
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DOI: https://doi.org/10.1007/BF02466026