1. B. P. Demidovich, Lectures on Mathematical Theory of Stability [in Russian], Nauka, Moscow (1967).
2. I. G. Malkin, “Stability under constant perturbations,” Prikl. Mat. Mekh., 8, No. 3, 241–245 (1944).
3. A. A. Martynyuk, V. Lakshmikantham, and S. Leela, Stability of Motion: Method of Integral Inequalities [in Russian], Naukova Dumka, Kyiv (1989).
4. A. De Luca and C. Manes, “Hybrid force/position control for robots in contact with dynamic environment,” in: Proc. 3rd IFAC Symposium on Robot Control SYROCO’91, Vienna (1991), pp. 377–382.
5. V. B. Larin, “Control problems for wheeled robotic vehicles,” Int. Appl. Mech., 45, No. 4, 363–388 (2009).