1. K. LANGE and Th. HERLAN (1990) Material and Energy Saving by Metal Forming Processes, Advanced Technology of Plasticity Vol. 1, p. 285
2. K. KUZMAN (1990) Energy Evaluation of Cold-Forming Processes, Annals of the CIRP Vol. 39/1, p. 253
3. B. C. KELLOCK (1976) Energy Conservation in Manufacturing, Machinery and Production Engineering 7, p. 13
4. H. KUDO (1990) Towards Net-Shape Forming, Journal of Materials Processing Technology 22, p. 307
5. H. J. KELLER (1990) Optimirung der Fertigungs-folge Kaltmassivumformen und Spanen, Draht 41/1, p. 40