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Original Russian Text © A.M. Krasnosel’skii, A.V. Pokrovskii, 2007, published in Differentsial’nye Uravneniya, 2007, Vol. 43, No. 2, pp. 212–238.
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Krasnosel’skii, A.M., Pokrovskii, A.V. Topologically stable subharmonics of large periods and amplitudes. Diff Equat 43, 218–245 (2007). https://doi.org/10.1134/S0012266107020097
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DOI: https://doi.org/10.1134/S0012266107020097