relation: http://acta.bibl.u-szeged.hu/42039/ title: Positive solution for a fourth order boundary value problem creator: Yang Bo date: 2005 type: Folyóirat type: NonPeerReviewed format: part language: hu identifier: http://acta.bibl.u-szeged.hu/42039/1/ejqtde_2005_003_001-017.pdf identifier: Yang Bo: Positive solution for a fourth order boundary value problem. (2005)