%0 Journal Article %A B. P. Allahverdiev %A H. Tuna %T Existence of solutions for nonlinear singular $q$-Sturm--Liouville problems %J Ufa mathematical journal %D 2020 %P 91-102 %V 12 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/UFA_2020_12_1_a6/ %G en %F UFA_2020_12_1_a6