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2. D. G. Stormont, Neftekhimicheskii Sintez za Rubezhom, No. 6 (1962).
3. Prospective Refineries of the USSR [in Russian], TsNIITÉneftekhim (1965).
4. I. R. Chernyi, Prospective Refineries of the USSR [in Russian], TsNIITÉneftekhim (1964).
5. N. A. Lapides and V. N. Polyakova, in: Gaseous Processes [in Russian] (1967), p. 147.