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2. Z. I. Syunyaev, Production, Upgrading, and Application of Petroleum Coke [in Russian], Khimiya, Moscow (1973).
3. T. Reis, Hydrocarbon Process.,54, No. 4 (1975).
4. S. R. Sergienko, High-Molecular-Weight Compounds in Petroleum [in Russian], Khimiya, Moscow (1964).
5. E. V. Smidovich, Oil and Gas Processing Technology [in Russian], Part 2, Khimiya, Moscow (1968).