http://www.hydrocarbons-technology.com/

http://www.conocophillips.com/EN/susdev/environment/cleanenergy/hydrocarbons/technology/Pages/index.aspx

http://www.grasys.com/products/gas/hydrocarbon/

http://www.woodheadpublishing.com/en/book.aspx?bookID=1923

http://www.technologyreview.com/energy/25894/