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[2] Mirapeix J, Cobo A, Cubillas A M, et al. Proceedings of SPIE, the International Society for Optical Engineering, 2008, 7003: 70031T.1.

[3] National Institute for Standards and Technology(NIST) atomic spectra database.

[4] Taylor B N, Kuyatt C E. Guidelines for Evaluating and Expressing the Uncertainty of NIST Measurement Results, NIST Technical Note 1297, 1994.