1. V. V. Kafarov, Principles of Mass Exchange [in Russian], Vysshaya Shkola (1962).
2. V. N. Stabnikov, Rectification Equipment [in Russian], Mashinostroenie (1965).
3. Chem. Ing. Techn.,35, No. 12, 831 (1963).
4. G. C. Ihrift, Petrol. Refiner.,33, No. 5 (1954).
5. V. I. Sheinman and I. A. Aleksandrov, Khim. i Tekhnol. Topliv i Masel, No. 5 (1962).