1. APHA, 2005. Standard Method 5220. Standard Test Method for Chemical Oxygen Demand (COD). Standard Methods for the Examination of Water and Wastewater, 21st ed. American Public Health Association Publication.
2. Fuels from Waste;Appell,1967
3. ASTM E1755-01. Standard Test Method for the Determination of Ash in Biomass. ASTM International.
4. ASTM E1756-01. Standard Test Method for Determination of Total Solids in Biomass. ASTM International.
5. Production of oil from plant material;Berl;Science,1944