1. The use of scrap tyres in the U.S. cement industry;Blumentahl;World Cem.,1992
2. Emerging technologies for utilising wastes in cement production;Dawson;World Cem.,1992
3. Relieving the environment through the utilization of secondary raw materials;Sprung;Zem.-Kalk-Gips,1992
4. Benefits and limitations when using secondary materials;Liebl;Zem.-Kalk-Gips,1993
5. Role of Minor Elements in Cement Manufacture and Use;Bhatty,1995