Manhertz, Gabor, and Akos Antal. “The Effect of Air-Fuel Equivalence Ratio Change on the Vibration Components of an Internal-Combustion Engine”. Recent Innovations in Mechatronics, vol. 2, no. 1-2., Apr. 2015, pp. 1-6., https://doi.org/10.17667/riim.2015.1-2/13.