Antonio Tineo2026-03-222026-03-22200310.1007/s10231-002-0055-zhttps://doi.org/10.1007/s10231-002-0055-zhttps://andeanlibrary.org/handle/123456789/50642Citaciones: 6enBounded functionMathematicsDegenerate energy levelsOdeMathematical analysisOrder (exchange)Mathematical physicsA result of Ambrosetti–Prodi type for first-order ODEs with cubic non-linearities. Part IIarticle