1. Am Geol Inst (1997) Dictionary of mining, mineral and related terms, 2nd edn. The American Geological Institute in cooperation with the Society for Mining, Metallurgy and Exploration
2. Andrews G (1989) Reactors for scaling up coal bioprocessing. EPRI symposium on biological processing of coal and coal-derived substances, Palo Alto, CA, USA, pp 1–17
3. Andrews G, Datta R (1991) Mass and energy balances for coal-based microbial systems. In: Proceedings of the second international symposium on biological processing of coal, San Diego, CA, USA. EPRI US Department of Energy: 2-1-2-21
4. Andrews G, Quintana J (1990) Mixing and mass transfer in an aerated trough bioreactor. In: Proceedings of the first international symposium on biological processing of coal. Orlando, FL, USA; Palo Alto, CA, USA. Electric Power Research Institute: 5-69-5-85
5. ASTM International D2492-02 (2007) Standard Test Method for Forms of Sulfur in Coal. West Conshohocken, PA 19428-2959