1. V. I. Erokhov, Toxicity of Modern Cars. Methods and Means of Reducing Harmful Emissions into the Atmosphere [in Russian], Forum, Moscow (2017).
2. M. K. Ibatov, A. S. Kadyrov, O. T. Balabaev, B. Sh. Askarov, and I. A. Pak, Device for Ultrasonic Purification of Exhaust Gases, Kazakhstan, Patent No. 3194, Published October 2, 2018.
3. M. K. Ibatov, A. S. Kadyrov, I. A. Pak, and B. Sh. Askarov, Exhaust Gas Insulation Device, Kazakhstan, Patent No. 26623, Published December 25, 2012.
4. M. K. Ibatov, A. S. Kadyrov, I. A. Pak, I. A. Kadyrova, and B. Sh. Askarov, Results of experimental studies of the operation of tank equipment for ultrasonic purification of motor vehicle exhaust gases, Ugol', No. 2, 73–78 (2020).
5. L. Bergman, Der Ultraschall und Seine Anwendung in Wissenschaft und Technik, Zurich (1954).