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- [1] COLOR-CENTERS OF IRON IN AMETHYST AND SYNTHETIC QUARTZ - REPLYAMERICAN MINERALOGIST, 1975, 60 (3-4) : 338 - 339COHEN, AJ
- [2] BIAXIAL COLOR-CENTERS IN AMETHYST QUARTZAMERICAN MINERALOGIST, 1974, 59 (7-8) : 709 - 718HASSAN, FCOHEN, AJ
- [3] ANISOTROPIC COLOR CENTERS RELATED TO IRON IMPURITY IN AMETHYST QUARTZTRANSACTIONS-AMERICAN GEOPHYSICAL UNION, 1969, 50 (04): : 357 - +HASSAN, FCOHEN, AJ
- [4] COLOR CENTERS OF IRON AS A CAUSE OF COLOR IN AMETHYSTZEITSCHRIFT FUR NATURFORSCHUNG PART A-ASTROPHYSIK PHYSIK UND PHYSIKALISCHE CHEMIE, 1967, A 22 (12): : 2080 - &LEHMANN, G
- [5] MODELS FOR COLOR-CENTERS IN SMOKY QUARTZPHYSICA STATUS SOLIDI A-APPLIED RESEARCH, 1982, 73 (02): : 593 - 596COHEN, AJMAKAR, LN
- [6] COLOR CENTERS IN THE ALPHA-QUARTZ CALLED AMETHYSTAMERICAN MINERALOGIST, 1956, 41 (11-2) : 874 - 891COHEN, AJ
- [7] MECHANISM OF THERMAL-CONVERSION OF COLOR AND COLOR-CENTERS BY HEAT-TREATMENT OF AMETHYSTNEUES JAHRBUCH FUR MINERALOGIE-MONATSHEFTE, 1984, (06): : 272 - 282NEUMANN, ESCHMETZER, K
- [8] COLOR CENTERS IN SYNTHETIC QUARTZJOURNAL OF CHEMICAL PHYSICS, 1954, 22 (07): : 1259 - 1260ARNOLD, GW
- [9] IMPURITY COLOR-CENTERS IN SYNTHETIC FLUORITE CRYSTALSINORGANIC MATERIALS, 1992, 28 (03) : 416 - 419CHEREDOV, VN