Babii, M.V., et al. “Justification of the Dependencies for Calculating Gripping Forces of Multifaceted Unresharpenable Plates in the Holder of a Cutoff Tool at Their Lateral Installation”. Bulletin of the Karaganda University. Mathematics Series, vol. 94, no. 2, June 2019, pp. 99-105, doi:10.31489/2019m2/99-105.