1. On Determining the Hardness of Grinding Wheels I;Colwell;Trans. ASME, B,1962
2. Peklenik, J. and Opitz, H., Testing of Grinding Wheel. Proc. MTDR, (1962), p.163.
3. The Impact of Engineering Materials on the Development of Fabrication Processes;Peklenik;Annals of CIRP.,1982
4. Bergstrom R.P., Machining tough abrasive plastics, Manufacturing Engineering, November (1983), p.61.
5. Survey of Material Behaviour in Machining;von Turkovich;Annals of CIRP,1981