1. K. Lange, Ubersicht uber Verfahren zur Erzeugung von Arbeitsflachen von Hohlformwerkzeug (Overview of processes to make working surfaces of dies and molds), Ind.-Anz 93 (1971) 199–200 (in German).
2. R.R. Binoniemi, D.T. Vukovich, New Eaton Forging Process, Eaton Corporation, Research and Development Center, Southfield, MI, 1981.
3. DIN 7526 (German Standard), Steel Forging Tolerances and Permissible Variations, 1969.
4. A. Bauer, Forging Without Flash as Economic Process Technology, Eumuco Publication, Eumuco Inc., Strongsville, OH, 1993.
5. J.R. Douglas, G.L. Horvat, Near-Net Forging of Spur Gears, Eaton Corporation, Manufacturing Technologies Center, Willoughby Hills, OH, 1983.