MAMYKIN, A. V.; KUKLA, A. L.; MAISTRENKO, A. S.; MATZAS, E. P.; MATVIENKO, L. M. A method for express estimation of the octane number of gasoline using a portable spectroimpedance meter and statistical analysis methods. Technology and design in electronic equipment, n. 4–5, p. 52-60, 28 Oct. 2017.