1. H. Horie, Y. Tanjo, T. Abe, K. Katayama, J. Shigetomi, EVS14 (1997).
2. M. Broussely, G. Rigobert, D. Virey, L. Souliac, J.P. Planchat, EVS14 (1997).
3. Guideline for Safety Evaluation on Secondary Lithium Cells (1997), Battery Association of Japan.
4. UL 1642 (1995), Underwriters Laboratory.