1. L. Zadeh, Fuzzy Sets / Information and Control, №8, 1965, pp.338-353.
2. A. Coffman, Introduction to the theory of indistinct sets: The lane with fr. - M.: Radio and communication, 1982. - 432 pages, silt.
3. V. Z. Manusov, E.A. Tokarenko, Diagnostics of Technical Condition of the Transformer Equipment on the basis of Indistinct Models / Scientific problems of transport of Siberia and the Far East, No. 1-2, 2014, pp.269-272.
4. Thomas L. Saaty. Relative Measurement and Its Generalization in Decision Making Why Pairwise Comparisionsare Central in Mathematics for the Measurement of Intangible Factors The Analytic Hierarchy / Network Process, No. 102, 2008, pp.251-318.
5. V. Z. Manusov, I. Kovalenkod, A. Dmitriyevs, A. Eroshenkos, Analysis of Indistinct Signs of of the Transformer Equipment Failures / Messenger of the Southern Ural State University. Series: Power, T. 13, No. 1., 2013, pp.124-127.