Yessenbayeva, G.A., K.S. Kutimov, Zh.R. Sazhinova, and Sarsenbek А.Zh. 2017. “On the Application of Mathematical Methods for the Research of Vibration Processes in Mechanics”. Bulletin of the Karaganda University. Mathematics Series 86 (2):55-63. https://doi.org/10.31489/2017m2/55-63.