By using the upper-lower solutions method and the fixed-point theorem on cone in a special space, we study the singular boundary value problem for systems of nonlinear second-order differential equations involving two parameters on the half-line. Some results for the existence, nonexistence and multiplicity of positive solutions for the problem are obtained.
"Positive Solutions for Nonlinear Singular Differential Systems Involving Parameter on the Half-Line." Abstr. Appl. Anal. 2012 1 - 20, 2012. https://doi.org/10.1155/2012/161925