Corrigendum to: Positive solutions for systems of generalized three-point nonlinear boundary value problems Johnny Henderson, Sotiris K. Ntouyas, Ioannis K. Purnaras (2008) Commentationes Mathematicae Universitatis Carolinae
Countably many solutions of a fourth order boundary value problem. Kosmatov, Nickolai (2004) Electronic Journal of Qualitative Theory of Differential Equations [electronic only]