___

• R. P. Agarwal, S. R. Grace, D. O’Regan: Oscillation Theory for Second Order Linear, Half–Linear, Superlinear and Sublinear Dynamic Equations, Kluwer Academic Publishers, 2002.
• R. P. Agarwal, M. Bohner, W.-T. Li: Nonoscillation and Oscillation Theory for Functional Differential Equations, Marcel Dekker, New York, 2004.
• R. P. Agarwal, M. Bohner, S. R. Grace, D. O’Regan: Discrete Oscillation Theory, Hindawi Publishing Corporation, 2005.
• S. H. Saker: Oscillation Theory of Delay Differential and Difference Equations: Second and Third Orders, Verlag Dr. Müller, 2010.
• Y. Sun, J. S. W. Wong: Oscillation criteria for second order forced ordinary differential equations with mixed nonlinearities, J. Math. Anal. Appl. 334 (2007), 549–560.
• R. P. Agarwal, M. Bohner, W.-S. Cheung, S. R. Grace: Oscillation criteria for forced second order differential equations with mixed nonlinearities, Math. Comput. Modelling 45 (2007), 965–973.
• Z. Zhang, X.Wang, H. Han: Oscillation criteria for forced second order differential equations with mixed nonlinearities, Appl. Math. Lett. 22 (7) (2009), 1096–1101.
• L. Erbe, T. S. Hassan, A. Peterson: Oscillation of third–order functional dynamic equations with mixed nonlinearities on time scales, J. Appl. math. Comput. 34 (2010), 353–371.
• T. S. Hassan, L. Erbe, A. Peterson: Forced oscillation of second order differential equations with mixed nonlinearities, Acta Math. Sci. Ser. B Engl. Ed. 31 (2) (2011). 613–626.
• A. Özbekler, A. Zafer: Second order oscillation of mixed nonlinear dynamic equations with several positive and negative coefficients, Duscrete Contin. Dyn. Syst. Suppl. 2011, 1167– 1175.
• Z. Xu, A. Cheng: Oscillation of second order differential equations with mixed nonlinearities, Turk J. Math. 38 (2014), 688–705.
• S. G. Samko, A. A. Kilbas, O. I. Marichev: Fractional Intergrals and Derivatives: Theory and Applications, Gordon and Beach Science, Yverdon, Switzerland, 1993.
• I. Podlubny: Fractional Diffeential Equations, vol. 198 of Mathematics in Science and Engineering, Academiv Press, San Diego, Calif., USA, 1999.
• R. Hilfer: Applications of Fractional Calculus in Physics, World Scientific Publishing Company, Singapore, 2000.
• S. R. Grace, R. P. Agarwal, P. J. Y. Wong, A. Zafer: On the oscillation of fractional differential equations, Fract. Calc. Appl. Anal. 15 (2) (2012), 222–231.
• D.-X. Chen: Oscillation criteria of fractional differential equations, Adv. Difference Equ. 2012, 2012:33.
• Q. Feng, F. Meng: Oscillation of solutions to nonlinear forced fractional differential equations, Electon. J. Differential Equations, Vol. 2013 (2013), No. 169, pp. 110.
• H. Qin, B. Zheng: Oscillation of a class of fractional differential equations with damping term, The Sci. World Journal Volume 2013, Article ID 685621, 9 pages.
• R. Xu: Oscillation criteria for nonlinear fractional differential equations, J. Appl. Math. Volume 2013, Article ID 971357, 7 pages.
• J. Yang, A. Liu, T. Liu: Forced oscillation of nonlinear fractional differential equations with damping term, Adv. Difference Equ. (2015) 2015:1.
• Y.-Z. Wang, Z.-L. Han, P. Zhao, S.-R. Sun: Oscillation theorems for fractional neutral differential equations, Hacet. J. Math. Stat. 44 (6) (2015), 1477-1488.
• Y. Pan, R. Xu: Some new oscillation criteria for a class of nonlinear fractional differential equations, Fract. Diff. Calc. 6 (1) (2016), 17–33.
• J. O. Alzabut, T. Abdeljawad: Sufficient conditons for oscillation of nonlinear fractional difference equations, J. Fract. Calc. Appl. 5 (1) (2014), 177–187.
• S. Kisalar, M. K. Yıldız, E. Aktopark: Oscillation of higher order fractional nonlinear difference equations, Internat. J. Differ. Equations 10 (2) (2015), 201–212.
• B. Abdalla, K. Abudaya, J. Alzabut, T. Abdeljawad: New oscillation criteria for forced nonlinear fractional difference equations, Vietnam J. Math. 45 (2017), 609-–618.
• J. Alzabut, T. Abdeljawad, H. Alrabaiah: Oscillation criteria for forced and damped nabla fractional difference equations, J. Comput. Anal. Appl. 24 (8) (2018), 1387–1394.
• B. Abdalla: On the oscillation of q–fractional difference equations, Adv. Difference Equ. 2017(1). Article Number: 254.
• G. H. Hardy, J. E. Littlewood, G. Polya: Inequalities, Cambridge University Press, Cambridge 1988.
• G. E. Andrews, R. Roy: Special Functions, Cambridge University Press, Cambridge 1999.