2016-06-102016-06-102003Franco Coronil, D., Nieto Roig, J.J. y O'Regan, D. (2003). Upper and lower solutions for first order problems with nonlinear boundary conditions. Extracta Mathematicae, 18 (2), 153-160.0213-8743http://hdl.handle.net/11441/42111application/pdfengAttribution-NonCommercial-NoDerivatives 4.0 Internacionalhttp://creativecommons.org/licenses/by-nc-nd/4.0/Upper and lower solutions for first order problems with nonlinear boundary conditionsinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccess