1. H. Salomon-de-Friedberg and W. G. Davenport, Vacuum Removal of Copper from Melted Steel Scrap,pp. 225-231. Metallurgical Society of C.I.M. Annual Volume(1977).
2. V. G. Leak, M. M. Fine and H. Dolezal, Rep.Invest., 7809, U.S. Bureau of Mines, Wash., D.C. (1973).
3. H. V. Makar and R. E. Brown, Rep.Invest. 7914, U.S. Bureau of Mines, Wash., D.C. (1974).
4. R. Harris, Vacuum Removal of Copper from Liquid Steel. M.Eng. Thesis, McGill University(1978).