1. W. T. Simpson and D. L. Peterson, J. Chem. Phys. 26, 588 (1957).JCPSA60021-9606
2. W. A. Bingel, Can. J. Phys. 37, 680 (1959).CJPHAD0008-4204
3. E. G. McRae, Australian J. Chem. 14, 329 (1961).AJCHAS0004-9425
4. A. Witkowski and W. Moffitt, J. Chem. Phys. 33, 872 (1960).JCPSA60021-9606
5. R. L. Fulton and M. Gouterman, J. Chem. Phys. 35, 1059 (1961).JCPSA60021-9606