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Mitropol'skii, Y.A., Samoilenko, A.M., Skorokhod, A.V. et al. Mykola Ivanovych Portenko (On His 60th Birthday). Ukrainian Mathematical Journal 54, 177–178 (2002). https://doi.org/10.1023/A:1020105710585
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DOI: https://doi.org/10.1023/A:1020105710585