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Additional information
Moscow State University. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 11, No. 2, pp. 28–38, April–June, 1977.
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Il'yashenko, Y.S. Remarks on the topology of singular points of analytic differential equations in the complex domain and Ladis' theorem. Funct Anal Its Appl 11, 105–113 (1977). https://doi.org/10.1007/BF01081888
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DOI: https://doi.org/10.1007/BF01081888