1. Overview of phosphate fertilizer production alternatives, phosphate rock production and quality factors;Van Kauwenbergh,2007
2. Renewable energy from gasification of manure; an innovative technology in search of fertile policy;Buckley;Environmental Monitoring and Assessment,2003
3. Perspectives on biomass gasification;Babu,2004
4. Gasification of problematic biofuels;Stoholm;Bioenergy Research,2007
5. Energy and greenhouse gas balances for pig manure using alternative treatment options;Poulsen,2008