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Moscow State University. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 10, No. 1, pp. 26–36, January–March, 1976.
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Zakalyukin, V.M. Lagrangian and Legendrian singularities. Funct Anal Its Appl 10, 23–31 (1976). https://doi.org/10.1007/BF01075768
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DOI: https://doi.org/10.1007/BF01075768