Sustainable gasification biochar systems? A case-study of rice-husk gasification in Cambodia, Part I: Context, chemical properties, environmental and health and safety issues - Shackley, Simon; Carter, Sarah; Knowles, Tony; Middelink, Erik; Haefele, Stephan; Sohi, Saran; Cross, Andrew; Haszeldine, Stuart (Elsevier, 2012)