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Berezanskii, Y.M., Romanenko, E.Y., Fedorenko, V.V. et al. Aleksandr Nikolaevich Sharkovsky (on his 60th birthday). Ukr Math J 48, 1815–1816 (1996). https://doi.org/10.1007/BF02375369
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DOI: https://doi.org/10.1007/BF02375369