1. GROCHE P., FRITSCHE D., TEKKAYA E.A., ALLWOOD J.M., HIRT G., NEUGEBAUER R. ‘‘Incremental Bulk Metal Forming” 57th CIRP General Assembly, Dresden(Germany), 19/08/2007–25/08/2007.
2. STANDRING P.M. ‘‘The significance of nutation angle in rotary forging’’ Advance Technology of Plasticity, Vol III. Proceedings of the 6th ICTP, Sept. 19–24, 1999.