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REFERENCES: "M. Gospodinov et al.. Physical properties of cubic Bi<sub>12</sub>SiO<sub>20</sub>, <i>Bulgarian J. Phys.</i> <b>15</b>, 140-143 (1988). Cited in <i>Handbook of Optics</i>, 3rd edition, Vol. 4. McGraw-Hill 2009"
COMMENTS: "Room temperature"
DATA:
  - type: formula 1
    range: 0.48 0.7
    coefficients: 1.72777 3.01705 0.2661
