___

• Anderson, D. R., Avery, R. I., (2002). Fixed point theorem of cone expansion and compression of functional type, J. Differ. Equn. Appl., 8 pp. 1073-1083.
• Avery, R.I., Henderson, J., O’Regan, D., (2008). Functional compression expansion fixed point theo- rem, Electron. J. Differ. Eqns., Ariticle ID 22.
• Avery, R. I., (1999). A generalization of the Leggett-Williams fixed point theorem, Math. Sci. Res. Hot-Line., 3, pp. 9-14.
• Bai, C., Sun, W., (2012). Existence and multiplicity of positive solutions for singular fractional bound- ary value problems, Comput. Math. Appl., 63 pp. 1369-1381.
• Bai, C., Sun, W., Zhang, W., (2013). Positive solutions for boundary value problems of a singular fractional differential equations, Abstr. Appl. Anal., article ID 129640.
• Bai, Z., L¨u, (2005). Positive solutions for boundary value problem of nonlinear fractional differential equation, J. Math. Anal. Appl., 311 pp. 495-505.
• Chai, G., (2013). Existence results of positive solutions for boundary value problems of fractional differential equations, Boundary Value Problems., Article ID 109.
• Goodrich, C. S., (2012). On a fractional boundary value problem with fractional boundary conditions, Appl. Math. Lett., pp. 1101-1105.
• Henderson, J., Luca, R., (2013). Existence and multiplicity for positive solutions of a system of higher- order multi-point boundary value problems, Nonlinear Differ. Equn. Appl., 3 pp. 1035-1054.
• Lakshmikanthan, V., (2008). Theory of fractional differential equations, Nonlinear Anal., TMA 69, pp. 3337-3343.
• Lakshmikanthan, V., Leela, S., Vasundhara Devi, J., (2009). Theory of Fractional Dynamic Systems., Cambridge Scientific Publishers, Cambridge.
• Liang, S., Zhang, J., (2009). Positive solutions for boundary value problems of nonlinear fractional differential equations, Nonlinear Anal., 71, pp. 5545-5550.
• Lu, X., Zhang, X., Wang, L., (2014). Existence of positive solutions for a class of fractional differential equations with m-point boundary value conditions, J. Sys. Sci. & Math. Scis., 34(2) pp. 1-13.
• Miller, K. S., Ross, B., (1993). An introduction to the Fractional Calculus and Fractional Differential Equations., Wiley, New York.
• Prasad, K. R., Kameswararao, A., Nageswararao, S., (2012). Existence of positive solutions for the system of higher order two-point boundary value problems, Proc. Indian Acad. Sci., 122(1) pp. 139- 152.
• Podlubny, I., (1999). Fractional Differential Equations., Academic Press, San Diego.
• Kilbas, A. A., Srivastava, H. M., Trujillo, j. J., (2006). Theory and Applications of Fractional Differ- ential Equations., North-Holland Mathematics Studies, 204, Elsevier Science B. V., Amsterdam.
• Sun, J., Zhang, G., (2007). A generalization of the cone expansion and compression fixed point theorem and applications, Nonlinear Anal., 67 pp. 579-586.
• Sun, Y., Zhang, X., (2014). Existence and nonexistence of positive solutions for fractional order two point boundary value problems, Advances in Diff. Equn., Article ID 53.
• Tian, C., Liu, Y., (2012). Multiple positive solutions for a class of fractional singular boundary value problem, Mem. Differ. Equn. Math. Phys., 56 pp. 115-131.
• Xu, X., Jiang, D., Yuan, C., (2009). Multiple positive solutions for the boundary value problems of a nonlinear fractional differential equation, Nonlinear Anal., 71 pp. 4676-4688.
• Zhang, X., Zhong, Q., (2017). Uniqueness of solution for higher-order fractional differential equations with conjugate type integral conditions, Fract. Calc. Appl. Anal., 20(6) pp. 1471-1484.
• Zhang, X., (2015). Positive solutions for a class of singular fractional differential equation with infinite- point boundary value conditions, Appl. Math. Lett., 39 pp. 22-27.
• Zhang, X., Zhong, Q., (2018). Triple positive solutions for nonlocal fractional differential equations with singularities both on time and space variables, Appl. Math. Lett., 80 pp. 12-19 .
• Zhang, X., Wang, L., Sun, Q., (2014). Existence of positive solutions for a class of nonlinear fractional differential equations with integral boundary conditions and a parameter, Appl. Math. Comput., 226 pp. 708-718.