RAFAEL MARÍA RUBIO RUIZ2026-01-292026-01-29201510.1016/j.jmaa.2015.06.0302-s2.0-84937517460https://www.scopus.com/inward/record.uri?eid=2-s2.https://ucocris.uco.es/handle/123456789/26255AnalysisApplied MathematicsAnalysisApplied Mathematicsresearch article