3) D. D. Eley and M. R. Willis, “Symposium on Electrical Conductivity in Organic Solids,” ed by H. Kallmann and M. Silver, Interscience Pub., London (1961), p. 257.
4) H. Inokuchi, Y. Harada, and Y. Maruyama, Bull. Chem. Soc. Jpn., 35, 1559 (1962).
5) D. E. Williams, J. Am. Chem. Soc., 89, 4280 (1967).