1. Energy from sewage sludge — start of a new era;Malik,1988
2. Recent developments in sludge disposal and use;Hall;Chemistry and Industry,1993
3. Drying of sewage sludge is important step in waste disposal;Gruter;Water Sci. Tech.,1990
4. Surface area development of sewage sludge drying pyrolysis;Lu;Fuel,1995
5. Bacaicoa PG, Bilbao R, Uson C. Sewage sludge gasification: first studies. University of Zaragoza, Spain. 1994; Project: 286-23