Fen, F. T., & Karaca, I. Y. (2016). Existence of positive solutions for nonlinear third-order $m$-point impulsive boundary value problems on time scales. Ukrains’kyi Matematychnyi Zhurnal, 68(3), 408-422. Retrieved from https://umj.imath.kiev.ua/index.php/umj/article/view/1848