1. 1) M. Stewart, JACOBS, 13. Annual Petcoke Conference, 2014, San Diego, USA.
2. 2) J. W. Gartland, U.S. Patent 2814076 (1957).
3. 3) M. P. Whittaker and L. I. Grindstaff, Carbon 7 (1969) 615–621.
4. 4) I. Letizia, High Temp. High Press. 9 (1977) 291–296.
5. 5) I. Letizia, High Temp. High Press. 9 (1977) 243–250.