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3. Geher, K., Theory of Network Tolerances, Akademiai Kiado, 1971; Moscow: Sov. radio, 2008.
4. Belyaev, N.A., Korovkin, N.V., Frolov, O.V., and Chudnyi, V.S., The Way to use bilinear theorem for optimizing power fluxes in energy systems, Elektrotekhn. Kompleksy Sist. Upr., 2012, no. 1.
5. http://www.energy.komisc.ru/cgi-bin/main.pI?page=8&extrapage=5 . Accepted 26.01.2012.