1. 1) R.L.Stephenson and R.M.Smailer : Direct Reduced Iron-Technology and Economics of Production and Use, ISS of AIME, Warrendale, (1980).
2. 2) Direct Reduction of Iron Ore-A Bibliographical Survey, The Metal Society, London, (1976).
3. 3) Steel Statistical Yearbook 1999, IISI, Brussel, (2000).
4. 4) "1999 World Direct Reduction Statistics", Supplement to Direct Midrex, (2000) 1, 2.
5. 5) "1995 World Direct Reduction Statistics", Supplement to Direct Midrex, (1996) 1, 3.