1. G. Feuillade and M. Jacquier,Entropie,49 (1973) 21.
2. Electrochem. Soc. Series;G.W. Heise,1971
3. P. Conrad ?Battery materials?, Noyes Data Corp. (1970), pp. 7, 24, 104.
4. Electrochem. Soc. Series;S.U. Falk,1969
5. Electrochem. Soc. Series;A. Fleischer,1971