1. Design and operation of small biogas plants;Abdel Dayem,1980
2. Biogas Newsletter August 1981;Biogas Newsl.,1981
3. Continuous-flow systems. Distribution of residence times;Dankwerts;Chem. Eng. Sci.,1953
4. A strategy for utilization of biomass energy in Egypt;El Halwagi,1982
5. The expected role of biogas technology in rural areas of Egypt: Energy considerations;Hamad,1981