1. L. G. Sillen, Ark. Kemi. Mineral. Geol. A 12(18), 1 (1937).
2. A. A. Chernov, Usp. Fiz. Nauk 100, 277 (1970).
3. S. Neov, V. Marinova, M. Reehuis, and R. Soontag, Appl. Phys. A 74, 1016 (2002).
4. Oxford Diffraction. Xcalibur CCD System, CrysAlisPro Software System, Version 1.171.32 (Oxford Diffraction Ltd., 2007).
5. CAD-4 Software. Version 5.0 (Enraf-Nonius, Delft, The Netherlands, 1989).