Vorobyov, V., M. Pomazan, S. Shlyk, and L. Vorobyova. “Simulation of Dynamic Fracture of the Borehole Bottom Taking into Consideration Stress Concentrator”. Eastern-European Journal of Enterprise Technologies, vol. 3, no. 1 (87), June 2017, pp. 53-62, doi:10.15587/1729-4061.2017.101444.