1. Algae mass cultivation – production and utilization;Becker;Process Biochemistry,1981
2. Utilization of aquatic plants;Boyd,1974
3. Integrated biogas technology in the Tropics. 2. Use of slurry for fish culture;Edwards;Waste Management and Research,1988
4. International Energy Outlook;EIA,2008
5. Operations optimization;Girts,1989