1. D. Green, UK patent 13708914, field March 1971.
2. The UKAEA conform method of continuous extrusion forming;Etherington;Wire Ind.,1977
3. The UKAEA conform method of continuous extrusion forming;Etherington;Wire Ind.,1977
4. the extrusion of aluminium and its alloys by the conform process;Etherington,1984
5. Recent development in conform and CASTEX continuous extrusion technology;Langerweger,1988