1. E. H. Carlson and G. H. Dieke, J. Chem. Phys. 34, 1602 (1961).JCPSA60021-9606
2. I. Richman and E. Y. Wong, J. Chem. Phys. 37, 2270 (1962).JCPSA60021-9606
3. J. B. Gruber and R. A. Satten, J. Chem. Phys. 39, 1455 (1963).JCPSA60021-9606
4. N. C. Chang, J. Chem. Phys. 44, 4044 (1966).JCPSA60021-9606
5. J. R. Henderson, M. Muramoto, and J. B. Gruber, J. Chem. Phys. 46, 2515 (1967).JCPSA60021-9606