Alt, Helmut. 2016. “Ansa Metallocene Complexes of Zirconium and Hafnium With –SiMe2-1,2-C6H4-CH2- Bridged Indenyl Ligands As Catalyst Precursors for Homogeneous Ethylene Polymerization”. Jordan Journal of Chemistry (JJC) 11 (3):147-57. https://jjc.yu.edu.jo/index.php/jjc/article/view/104.