1. R. C. Mehrotra, R. Bohra, and D. P. Gaur, Metal β-Diketonates and Allied Derivatives. Academic Press, London (1978).
2. W. T. Carnall, in: Handbook on the Physics and Chemistry of Rare Earths, K. A. Gschneidner and L. R. Eyring (eds.), Vol. 3, North Holland, Amsterdam (1979), Chap. 24.
3. E. Soini and T. Lövgren, CRC Crit. Rev. Anal. Chem.,18, 105 (1987).
4. B. Marciniak, M. Elbanowski, and S. Lis, Monats. Chem.,119, 669 (1988).
5. M. Elbanowski and S. Lis, Fresenius Z. Anal Chem.,330, 698 (1988).