Differential Equations & Applications · Volume 11, Issue 4 Positive solutions for a singular coupled system of nonlinear higher-order fractional q-difference boundary value problems with two parameters 11-25 Pages 509-529 DOI 10.7153/dea-2019-11-25 Downloads Short PDF Full PDF PNG Authors Wengui Yang Keywords fractional q-difference systems coupled integral boundary conditions positive solution Green's function fixed point theorems Subject classes 39A13 34B18 34A08