CONSUELO RAMIREZ TORREBLANCA2026-01-292026-01-29201210.1016/j.jmaa.2011.08.0782-s2.0-80054075098https://www.scopus.com/inward/record.uri?eid=2-s2.https://ucocris.uco.es/handle/123456789/23421AnalysisApplied MathematicsAnalysisApplied Mathematicsresearch article