1. R. A. Mott (ed. P. Singer), Henry Cort: the great finer (Metals Society, London 1983), 31–36; English patents, nos. 1351 and 1420.
2. P. Schweissguth; Z. VDI, Vol.62, 1918, pp.1281–310.
3. Valberg, H.:“Experimental techniques to characterize large plastic dformations in unlubricated hot Al extrusion”, Key. Eng. Mat., Vol.367, 2008, pp.17–24.
4. C. Blazey, L. Broad, W.S. Gummer, and D.B. Thompson: J. Inst. Met.,1948–49, vol. 75, pp. 163–84.
5. J. Kandis and H. Valberg:“Metal flow in two-hole extrusion of Al-alloys studied by FEA with experiments”, Key Eng. Mat., Vol. 504–506, 2012, pp.493–498.