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Research partially supported by DGICYT, project PB91-0793.
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Nieto, J.J., Alvarez-Noriega, N. Periodic boundary value problems for nonlinear first order ordinary differential equations. Acta Math Hung 71, 49–58 (1996). https://doi.org/10.1007/BF00052194
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DOI: https://doi.org/10.1007/BF00052194