1. McConnell, H.M. and Heller, C. and Cole, T. and Fessenden, R.W. (1960) J. Amer. chem. Soc., 82, pp. 766 - 766.
2. Ghosh, D.K. and Whiffen, D.H. (1959) Mol. Phys., 2, pp. 285 - 285.
3. Atherton, N.M. and Whiffen, D.H. (1960) Mol. Phys., 3, pp. 1 - 1. 103
4. Heller, C. and McConnell, H.M. (1960) J. chem. Phys., 32, pp. 1535 - 1535.
5. Pooley, D. and Whiffen, D.H. (1961) Mol. Phys., 4, pp. 81 - 81.