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Kiguradze, I.T., Mukhigulashvili, S.V. On Nonlinear Boundary Value Problems for Two-Dimensional Differential Systems. Differential Equations 40, 797–806 (2004). https://doi.org/10.1023/B:DIEQ.0000046858.00159.68
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DOI: https://doi.org/10.1023/B:DIEQ.0000046858.00159.68