%0 Journal Article %A Tom Ziegler %A Kumar Vanka %A Zhitao Xu %T The influence of the counterion B(C6F5)3CH3– and solvent effects on the propagation and termination steps of ethylene polymerization catalyzed by Cp2ZrR+ (R = Me,Pr). A density functional study %J Comptes Rendus. Chimie %D 2005 %P 1552-1565 %V 8 %N 9-10 %I Elsevier %R 10.1016/j.crci.2004.10.036 %G en %F CRCHIM_2005__8_9-10_1552_0