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Dedicated to I. M. Gel'fand on his 80th birthday
Moscow Physical Technical Institute. Moscow State University. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 28, No. 1, pp. 3–15, January–March, 1994.
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Berest, Y.Y., Veselov, A.P. Hadamard's problem and coxeter groups: New examples of Huygens' equations. Funct Anal Its Appl 28, 3–12 (1994). https://doi.org/10.1007/BF01079005
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DOI: https://doi.org/10.1007/BF01079005