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Institute of Chemical Physics, Academy of Sciences of the USSR. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 20, No. 3, pp. 35–41, July–September, 1986.
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Givental’, A.B. Lagrangian imbeddings of surfaces and unfolded Whitney umbrella. Funct Anal Its Appl 20, 197–203 (1986). https://doi.org/10.1007/BF01078471
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DOI: https://doi.org/10.1007/BF01078471