We study the existence and uniqueness of positive solutions for a class of singular m-point boundary value problems of second order differential equations on a measure chain. A sharper sufficient condition for the existence and uniqueness of positive solutions as well as positive solutions is obtained by the technique of lower and upper solutions and the maximal principle theorem.
"New Results for Multipoint Singular Boundary Value Problems on a Measure Chain." Abstr. Appl. Anal. 2014 1 - 9, 2014. https://doi.org/10.1155/2014/465653