1. Information on http://formdrill.com/english/formdrill.htm
2. Information on http://www.centerdrill.de
3. Formation of attachment points in thin-walled parts by plastic drilling;Khomenko,2005
4. Improving the technology of processing thin-walled parts by plastic drilling;Zolotov,2007
5. Thermal Friction Drilling S. A. El-Bahloul, H. E. El-Shourbagy, M. Y. Al-Makky T. T. El-Midany / ASAT-15-071-ET