1. 1)N.Tsuchiya,H.Ooi,A.EjimaandK.Sambongi:SymposiumonExternalDesulphurizationofHotMetal,McMasterUniv.May(1975),No.9.
2. 2)C.YoshiiandK.Shimanaka:Tetsu−to−Hagan\'{e},43(1957),807(inJapanese).
3. 3)Y.Kawai,K.MoriandY.San−nomiya:Tetsu−toHagan\'{e},61(1975),29(inJapanese).
4. 4)B.Trentini,L.WahlandM.Allard:J.IronSteelInst.,183(1956),124.
5. 5)U.P\"{u}ckoff:SymposiumonExternalDesulphurizationofHotMetal,McMasterUniv.May(1975),No.8.