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Bukzhalev, E.E. On the Construction of Upper and Lower Solutions by the Nagumo Method. Differential Equations 40, 771–779 (2004). https://doi.org/10.1023/B:DIEQ.0000046855.29005.1d
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DOI: https://doi.org/10.1023/B:DIEQ.0000046855.29005.1d