1. Fly ash aggregates;Bijen,1983
2. An investigation into the production of sintered PFA aggregate;Harrison,1975
3. The theory and practice of disc balling;Floyd,1967
4. Granulation;Sherrington,1981
5. Messman, C. and Tibbetts, T. E. ‘Elements of briquetting and agglomeration’, Institute of Briquetting and Agglomeration, Las Graces N.M. USA.