1. Copper and Copper Alloys. http://www.keytomet-als.com/Article27.html
2. Continuous Melting. http://bse.sci-lib.com/article081225.html
3. Copper in Architecture. http://www.know-house.ru/pdf-books/copperbook.pdf
4. Technology of Correction in ARKU Rolls. http://www.tkzentrum.ru/equipment/arku/item17/
5. Straightening Machines. http://www.tehnoinfa.ru/kuznechnoeoborudovanie/109.html