1. M. Debeau and M. Poulet, Spectrochim. Acta,25A, 1553 (1969).
2. V. I. Sergienko, L. N. Ignat'eva, and T. F. Levchishina, Koord. Khim.,3, 480 (1977).
3. V. I. Sergienko, L. N. Ignat'eva, and V. M. Kalenik, Zh. Strukt. Khim.,20, No. 5, 957 (1979).
4. S. P. Gabuda and S. V. Zemskov, Nuclear Magnetic Resonance in Complex Compounds [in Russian], Nauka, Novosibirsk (1976).
5. L. Ramakrishnan, S. Sundarajan, V. S. S. Sastry, et al., ?Nuclear quadrupole resonance in coordination compounds?, Coord. Chem. Rev.,22, 123 (1977).