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I. M. Gubkin Institute for Petroleum Technology and Gas Industry. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 14, No. 2, pp. 4–14, April–June, 1980.
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Givental’, A.B. Displacement of invariants of groups that are generated by reflections and are connected with simple singularities of functions. Funct Anal Its Appl 14, 81–89 (1980). https://doi.org/10.1007/BF01086548
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DOI: https://doi.org/10.1007/BF01086548