1. Unpublished data, Private communication from W. Cantor, TPI Inc., Exton, PA, USA.
2. The role of recombination catalysts in VRLA cells
3. Proceedings of the 10th International Telecomm. Energy Conference (Intelec 88);Brecht,1988
4. Proceedings of the 11th International Telecomm. Energy Conference (Intelec 89);Brecht,1989