1. Replacing the Battery in Portable Electronics
2. C. Hebling, in: Proceedings of the 7th Grove Fuel Cell Symposium, London, 11–13 September 2001.
3. J.C. Bailey, in: Proceedings of the Symposium on the Commercialization of Small Fuel Cells, Bethesda, MD, USA, 29–30 April 1999, Knowledge Foundation, Boston.