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3. V. F. Salokhin and G. G. Spirin, Inzh.-Fiz. Zh.,35, No. 6 (1978).
4. M. N. Ozisik, Radiative Heat Transfer and Interactions with Conduction and Convection, Wiley, New York (1973).
5. V. I. Pagurova, Tables of Integroexponential Functions [in Russian], VTs AN SSSR (1959).