1. Danan, J., De Novion, C.H., Guerin, Y., Wedgwood, F.A., Kuznietz, M.: J. Phys. (Paris) 37 (1976) 1169.
2. Griveau, B., Marcon, J.P., Gatesoupe, J.P.: J. Inorg. Nucl. Chem. 34 (1972) 1535.
3. D'Eye, R.W.M., Sellman, P.G., Murray, J.R.: J. Chem. Soc. III (1952) 2555.
4. Haessler, M., De Novion, C.H.: J. Phys. C; Solid State Phys. 10 (1977) 589.
5. Suski, W.: “Uranium Chalcogenides”, Inst. for Low Temperature and Structure Research, Polish Acad. of Science, Wroclaw 1976.