1. ISO 18122:2015 Solid Biofuels - Determination of Ash Content,2015
2. Standardized product definition and product testing guidelines for biochar that is used in soil;International Biochar Initiative,2015
3. Reducing health impacts of biomass burning for cooking-the need for cookstove performance testing;Abeliotis;Energy Efficiency,2013
4. ASTM D4442-92(2003): Standard Test Methods for Direct Moisture Content Measurement of Wood and Wood-based Materials;American Society for Testing and Materials,2003
5. Characterization and treatment of tars from biomass gasifiers;Baker,1988