1. Kh.S. Bagdasarov, Crystal Growth, Vol. 11, EGU Publishing House, Erevan, 1977, p. 179. (in Russian).
2. Growth of alexandrite crystals and investigation of their properties
3. H.P. Utech, W.S. Brower, J.G. Early, in: H.S. Peiser (Ed.), Crystal Growth, Suppl. J. Phys. Chem. Solids, Oxford, 1967, p. 201.