1. Mathematics and Its Applications;M. Greguš,1987
2. Song, Q., Dong, X., Bai, Z., Chen, B.: Existence for fractional Dirichlet boundary value problem under barrier strip. J. Nonlinear Sci. Appl. 10, 3562–3598 (2017)
3. Bai, Z., Zhang, S., Sun, S., Yin, C.: Monotone iterative method for fractional differential equations. Electron. J. Differ. Equ. 2016, 6 (2016)
4. Bai, Z., Dong, X., Yin, C.: Existence results for impulsive nonlinear fractional differential equation with mixed boundary conditions. Bound. Value Probl. 2016, 63 (2016)
5. Du, Z., Zhao, B., Bai, Z.: Solvability of a third-order multipoint boundary value problem at resonance. Abstr. Appl. Anal. 2014, Article ID 931217 (2014)