1. Executive order D-5-99 by the Governor of the State of California, 25 March 1999.
2. H.D. Sloan, R. Birkhoff, M.F. Gilbert, A. Pyhälahti, M. Nurminen, NPRA 2000 Annual meeting, AM-00-34.
3. Anonymous, Eur. Chem. News 72 (No. 1893) (2000) 35.
4. Anonymous, Eur. Chem. News 72 (No. 1894) (2000) 39.
5. Dimerization of n-Butenes for High Octane Gasoline Components