1. Energy crops to methane;Stewart,1979
2. Methane production from marine biomass;Chynoweth,1980
3. Biogas production from crops and organic wastes;Badger;New Zealand J. Sci.,1979
4. Green leaf manuring and green manuring;Kantiraj;The Madras Agricultural Journal,1950
5. Standard methods for the examination of water and waste water;American Public Health Association,1980