High Molecular Weight Polypropylene through Specifically Designed Zirconocene Catalysts by Walter Spaleck et al., Angewandte Chemie, Bd. 31, Nr. 10, Oct. 1992, pp. 1347-1350, Weinheim, Germany. |
ansa-Metallocene derivatives by Peter Burger et al., Journal of Organometallic Chemistry, Bd. 417, No. 1-2, Oct. 1, 1991, pp. 9-27, Lausanne. |
Mechanisms of Stereochemical Control in Propylene Polymerizations with Soluble Group 4B Metallocene/Methylalumoxane Catalysts by John A. Ewen, J. Am. Chem. Soc., Bd. 106, 1984, pp. 6355-6364. |
Stevens, Metallocene and Other Single Site Catalysts, The Dow Chemical Co., PTO Presentation, Dec. 8, 1994. |