1. J. Podlahova and J. Podlaha, Coll. Czech. Chem. Comm., 1980, 45, 2049 8OPPa C. Panda and R.K. Patnaik, J. Indian Chem. Soc., 1980, 57, 23
2. J. Podlahova and J. Podlaha, Coll. Czech. Chem. Comm., 1982, 47, 1078
3. N.M. Dyatlova, V.V. Medyntsev, T.Ya. Medved, and M.I. Kabachnik, J. Gen. Chem. USSR, 1968, 38, 1025 (1065)
4. M. Wozniak and G. Nowogrocki, J. Chem. Soc. Dalton, 1981, 2423
5. A.P. Filippov and O.A. Polishchuk, Russ. J. Inorg. Chem., 1980, 25, 1495 (2711)