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3. L. A. Boyarskii and R. I. Efremova, Applied Mechanics and Technical Physics, No. 6 (1962).
4. V. E. Finkel'shtein and V. V. Kandyba, Transactions of the VNIIM, No. 36 (96) (1958).
5. GOST 9411-60 on ?Colored optical glass.?