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3. M. I. Otsisik, Compound Heat Exchange [in Russian], Moscow (1976).
4. B. P. Demidovich, I. A. Maron, and É. Z. Shuvalova, Numerical Methods of Analysis [in Russian], Moscow (1963).
5. G. L. Polyak, Izv. Energ. Inst. im. Krizhizhanovskogo,3, 53?75 (1935).