1. Goval, S. K., Kolstad, J. J., Hauschildt, F. W., Venardos, D. G, and Joval, C. L. M.Process for producing needle coke. U.S. Patent No. 5,286,371, Feb. 15, 1994.
2. Study of carbonization using a tube bomb: evaluation of lump needle coke, carbonization mechanism and optimization
3. Murakami, T.; Nakaniwa, M.; Nakayama, Y.; Masuo, M.Hydrogenation catalyst for coal tar, a method of hydrogenation of coal tar with use of such catalyst and a method of producing super needle coke from the hydrogenation product of coal tar. U.S. Patent No. 4,855,037, Aug. 8, 1989.
4. Hoover, D.Process for production of premium grade needle coke from a hydrotreated SRC material. U.S. Patent No. 4,737,261, Aug. 8 1988.
5. Kelley, A.; Block, M. J.; Skripek, M.Method for producing needle coke. U.S. Patent No. 4,521,278, June 4, 1985