1. O. Hellman, Introduction to the Optimal Search Theory (Nauka, Moscow, 1985) [in Russian].
2. R. Alvede and I. Vegsner, Search Problems (Mir, Moscow, 1985) [in Russian].
3. V. A. Abchuk and V. G. Suzdal’, Search of Objects (Sov. Radio, Moscow, 1977) [in Russian].
4. V. I. Arkin, “Problem of Optimal Allocation of Search Efforts,” Teor. Veroyat. Prim. 9(1), 179–180 (1964).
5. V. V. Malyshev, M. M. Krasil’shchikov, and V. I. Karlov, Optimal Observations and Control of Aircraft (Mashinostroenie, Moscow, 1989) [in Russian].