http://www.netl.doe.gov/technologies/coalpower/fuelcells/seca/pubs/FCHandbook7.pdf
http://www.thaiscience.info/Article%20for%20ThaiScience/Article/3/Ts-3%20fuel%20cells%20-%20energy%20technology%20for%20the%20future.pdf
http://teenet.chiangmai.ac.th/emac/journal/2002/15/08.pdf