Mamykin, A.V., Kukla, A.L., Maistrenko, A.S., Matzas, E.P. and Matvienko, L.M. 2017. 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. 4–5 (Oct. 2017), 52-60. DOI:https://doi.org/10.15222/TKEA2017.4-5.52.