1. V. S. Sagaradze and L. V. Malygina, Metal. i Term. Obrabotka Metal., No. 7 (1965).
2. I. M. Lyubarskii, Increasing the Wear Resistance of Heavily Loaded Gears [in Russian], Moscow (1965).
3. M. M. Saverin, Shot Peening [in Russian], Mashgiz, Moscow (1955).