Сурду, Н., А. Тарелин, А. Телегин, and А. Фистик. “Creation of a Planetary Head for Flat Grinding of Tough-to-Machine Materials”. Eastern-European Journal of Enterprise Technologies, vol. 3, no. 2(45), Apr. 2010, pp. 13-19, doi:10.15587/1729-4061.2010.2751.