The existence of at least one positive solution is established for a class of semipositone fractional differential equations with Riemann-Stieltjes integral boundary condition. The technical approach is mainly based on the fixed-point theory in a cone.
"Existence of Positive Solution for Semipositone Fractional Differential Equations Involving Riemann-Stieltjes Integral Conditions." Abstr. Appl. Anal. 2012 (SI11) 1 - 17, 2012. https://doi.org/10.1155/2012/723507