1. A. M. Zverkin, G. A. Kamenskii, and S. B. Norkin, Statement of the Initial Problem for Differential Equations with Leading Arguments. Uspekhi Matem. Nauk,15, No. 6, 133–136 (1960).
2. G. A. Kamenskii, Boundary Value Problem for First-Order Nonlinear Differential Equations with Deviating Neutral-Type Arguments, Transactions of the Seminar on the Theory of Differential Equations with Deviating Arguments [in Russian], Vol. 3, Univ. im. Patrice Lumumba (1965), pp. 39–45.
3. A. V. Kibenko and A. I. Perov, On a Two-Point Boundary Value Problem with a Parameter, Uch. Zapiski Azer. Univ., No. 2 (1961), pp. 21–30.
4. A. V. Kibenko, Method of Successive Approximations for the Two-Point Problem for Equations with Parameters, Uch. Zapiski Azer. Univ., No. 6 (1961). pp. 13–21.
5. L. S. Rakovshchik, Synthesis of Admissible Controls, Avtomat. i Telemekhan.,23, No 10, 1277–1283, (1962).