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- [2] Optical absorption spectrum of Cr3+ ions in sodium ammonium sulphate dihydrate single crystal Kumar, R.Rama, 1600, Gordon & Breach Science Publ Inc, Newark, NJ, United States (19): : 3 - 4
- [7] Distorted octahedral sites of Cr3+ doped sodium phosphate glasses GLASS TECHNOLOGY, 2002, 43 (01): : 32 - 33