1. A. D. Myshkis, “On some problems in the theory of differential equations with deviating argument,” in: Differential Equations with Deviating Argument [in Russian], Kiev (1977), pp. 221–247.
2. A. R. Magomedov, “Periodic and almost periodic solutions of differential equations with maxima,” Mat. Fiz. Nelin. Mekh., No. 18, 3–6 (1993).
3. A. R. Magomedov, “Existence and uniqueness theorems for solutions of differential equations with maxima that contain a functional parameter,” Arch. Math., No. 3–4, 139–154 (1992).
4. D. D. Bainov and N. G. Kazakova, “A finite-deference method for solving the periodic problem for autonomous differential equations with maxima,” Math. J. Toyama Univ., 15, 1–13 (1992).
5. T. Jankovski, “Systems of differential equations with maxima,” Dokl. Akad. Nauk Ukr., No. 8, 57–60 (1997).