[1] Braverman, E., Chatzarakis, G.E., Stavroulakis, I.P.: 
Iterative oscillation tests for differential equations with several non-monotone arguments. Adv. Difference Equ., 87, 2016,  
MR 3479781[2] Braverman, E., Karpuz, B.: 
On oscillation of differential and difference equations with non-monotone delays. Appl. Math. Comput., 218, 7, 2011, 3880-3887,  
MR 2851485[3] Chatzarakis, G.E.: Differential equations with non-monotone arguments: Iterative Oscillation results. J. Math. Comput. Sci., 6, 5, 2016, 953-964, 
[6] Chatzarakis, G.E., Li, T.: 
Oscillation criteria for delay and advanced differential equations with non-monotone arguments. Complexity, 2018, 2018, 1-18, Article ID 8237634..  
DOI 10.1155/2018/8237634 | 
MR 3620160[8] Erbe, L.H., Kong, Qingkai, Zhang, B.G.: 
Oscillation Theory for Functional Differential Equations. 1995, Monographs and Textbooks in Pure and Applied Mathematics, 190. Marcel Dekker, Inc., New York,  
MR 1309905[9] Erbe, L.H., Zhang, B.G.: 
Oscillation of first order linear differential equations with deviating arguments. Differential Integral Equations, 1, 3, 1988, 305-314,  
MR 0929918[12] Jian, C.: 
On the oscillation of linear differential equations with deviating arguments. Math. in Practice and Theory, 1, 1, 1991, 32-40,  
MR 1107456[13] Kon, M., Sficas, Y.G., Stavroulakis, I.P.: 
Oscillation criteria for delay equations. Proc. Amer. Math. Soc., 128, 10, 2000, 2989-2998,  
DOI 10.1090/S0002-9939-00-05530-1 | 
MR 1694869[14] Koplatadze, R.G., Chanturija, T.A.: 
Oscillating and monotone solutions of first-order differential equations with deviating argument. Differentsiaµnye Uravneniya, 18, 8, 1982, 1463-1465, (in Russian).  
MR 0671174[15] Koplatadze, R.G., Kvinikadze, G.: 
On the oscillation of solutions of first order delay differential inequalities and equations. Georgian Math. J., 1, 6, 1994, 675-685,  
DOI 10.1007/BF02254685 | 
MR 1296574[17] Ladas, G., Lakshmikantham, V., Papadakis, L.S.: 
Oscillations of higher-order retarded differential equations generated by the retarded arguments. Delay and functional differential equations and their applications, 1972, 219-231, Academic Press,  
MR 0387776[18] Ladde, G.S.: 
Oscillations caused by retarded perturbations of first order linear ordinary differential equations. Atti Acad. Naz. Lincei Rendiconti, 63, 5, 1977, 351-359,  
MR 0548601[19] Ladde, G.S., Lakshmikantham, V., Zhang, B.G.: 
Oscillation Theory of Differential Equations with Deviating Arguments. 1987, Monographs and Textbooks in Pure and Applied Mathematics, 110, Marcel Dekker, Inc., New York,  
MR 1017244 | 
Zbl 0832.34071[21] El-Morshedy, H.A., Attia, E.R.: 
New oscillation criterion for delay differential equations with non-monotone arguments. Appl. Math. Lett., 54, 2016, 54-59,  
DOI 10.1016/j.aml.2015.10.014 | 
MR 3434455[22] My¹kis, A.D.: 
Linear homogeneous differential equations of first order with deviating arguments. Uspekhi Mat. Nauk, 5, 36, 1950, 160-162, (in Russian).  
MR 0036423[23] Yu, J.S., Wang, Z.C., Zhang, B.G., Qian, X.Z.: 
Oscillations of differential equations with deviating arguments. Panamer. Math. J., 2, 2, 1992, 59-78,  
MR 1160129[24] Zhang, B.G.: 
Oscillation of solutions of the first-order advanced type differential equations. Science Exploration, 2, 1982, 79-82,  
MR 0713776[25] Zhou, D.: On some problems on oscillation of functional differential equations of first order. J. Shandong University, 25, 1990, 434-442,