1. Gnedenko B.V.: On cold double redundant system. Izv. AN SSSR. Texn. Cybern. 4, 3–12 (1964). (in Russian)
2. Gnedenko B.V.: On cold double redundant system with restoration. Izv. AN SSSR. Texn. Cybern. 5, 111–118 (1964). (in Russian)
3. Solov’ev A.D.: On reservation with quick restoration. Izv. AN SSSR. Texn. Cybern. 1, 56–71 (1970). (in Russian)
4. Rykov, V., Ngia, T.A.: On sensitivity of systems reliability characteristics to the shape of their elements life and repair time distributions. Vestnik PFUR. Ser. Mathematics. Inform. Phys. 3, 65–77 (2014). (in Russian)
5. Communications in Computer and Information Science;D Efrosinin,2014