1. G. Halpert, S. R. Narayanan, T. Valdez, W. Chun, H. Frank, A. Kindler, S. Surampudi, J. Kosek, C. Cropley, and A. LaConti , inProceedings of the 32nd Intersociety Energy Conversion Engineering Conference, AIChE, p. 774 (1997).
2. S. Gottesfeld and M. S. Wilson , inEnergy Storage Systems for Electronics Devices, T. Osaka and M. Datta , Editors, p. 487, Gordon and Breach Science Publishers, Singapore (2000).
3. S. R. Narayanan, T. I. Valdez, and N. Rohatgi , inHandbook of Fuel Cells, W. Vielstich , H. A. Gasteiger , and A. Lamm , Editors, p. 894, Wiley, Chichester, England (2003).
4. C. Y. Wang , inHandbook of Fuel Cells, W. Vielstich , H. A. Gasteiger , and A. Lamm , Editors, p. 337, Wiley, Chichester, England (2003).