1. Shell higher olefins process
2. G. W. Parshall , Homogeneous Catalysis , Wiley , New York , 1980 , pp. 176–177
3. Plastics Europe Deutschland, WG Statistics and Market Research; cf. http://www.vke.de/de/infomaterial/download
4. Y. V. Kissin , in Kirk-Othmer Encyclopedia of Chemical Technology , Wiley & Sons, Inc , 2005