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3. L. V. Gurvich, G. A. Khachkuruzov, and V. M. Medvedev, Thermodynamic Properties of Individual Substances [in Russian], Izd. AN SSSR, 1962.
4. G. Herzberg, Molecular Spectra and Molecular Structure, vol. 1: Spectra of Diatomic Molecules [Russian translation], Izd-vo inostr. lit., Moscow, 1949.
5. D. B. Olff, Equilibrium emissivity calculation of hydrogen plasma at temperatures up to 10,000° K, J. Quant. Spectrosc. Rad. Transfer, vol. 1, no. 2, 1961.