1. Chim. et Ind. Sonderband 23, Congr. Int. Chem. Ind.;Viard,1950
2. G.F. Bubnick, Brit. UK Pat. Appl. GB 2,202,670 (C1.H01M6/18).
3. H. Saito, Y. Aoshima, Kokai Tokkyo Koho JP, 63, 66, 864 [88, 66, 864] (C1.H01M10/40).
4. R. Shishikura, H. Konuma, M. Kobayashi, Jpn. Kokai Tokkyo Koho JP, 61, 232, 573 [86, 232, 573].