1. D. N. Davis, Ap. J.,106, 28, 1947.
2. I. Kovács andA. Lagerqvist, Atk. Fys.,2, 411, 1950.
3. I. Kovács, Rotational Structure in the Spectra of Diatomic Molecules, Adam Hilger Ltd., London, 1969.
4. T. Wentink, Jr., andR. J. Spindler Jr., JQSRT.B 1, 753, 1968.
5. N. R. Tawde andV. G. Tulasigeri, J. Phys.B 5, 1681, 1972.