参考文献
Finkel'shtein, A. I.
Optika i Spektroskopiya, 1959 , vol. 6, p. 17 - 19
Optika i Spektroskopiya, 1959 , vol. 6, p. 33 - 38
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Gmelin Handbook: C: MVol.D1, 37.7.1, page 359 - 359
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Finkel'shtein, A. I.
Materialy 3-go Ural'sk. Soveshch. po Spektroskopii Inst. Fiz. Metal Akad. Nauk SSSR Komis. po Spektroskopii, Sverdlovsk 1960 (1962), S. 171/3