1. Economic route for natural gas conversion to ethylene and propylene
2. Chemical Week, October 2, 2002.
3. European Chemical News, October 14–20, 2002.
4. London, CNI, March 31, 2003.
5. C.D. Chang, W.H. Lang, A.J. Silvestri, U.S. Patent 4,062,905 (1977).