1. A. A. Agrachev and R. V. Gamkrelidze, “Symplectic geometry and necessary optimality conditions,” Mat. Sb., 182, No.1, 36–54.
2. V. M. Alekseev, V. M. Tikhomirov, and S. V. Fomin, Optimal Control [in Russian], Nauka, Moscow (1980).
3. V. I. Arnol’d, Ordinary Differential Equations [in Russian], Nauka, Moscow (1980).
4. V. F. Borisov, “Fuller phenomenon: A survey,” In: Progress in Science and Technology, Series on Contemporary Mathematics and Its Applications, Thematical Surveys [in Russian], 55, Dynamical System-8, All-Russian Institute for Scientific and Technical Information, Russian Academy of Sciences, Moscow (1998).
5. V. F. Borisov and M. I. Zelikin, “Regimes of increasing in frequency switchings in the time-optimal control problem,” Prikl. Mat. Mekh., 52, No.6, 934–946 (1988).