O. Babanin, O. Butskiy, O. Kovalenko, and M. Maksimov, “Application of Synthetic Filters from Polypropylene in Diesel Locomotive Oil Systems to Improve the Efficiency of Cleaning Engine Oil”, IJET, vol. 7, no. 4.3, pp. 162–166, Sep. 2018, doi: 10.14419/ijet.v7i4.3.19728.