%0 Journal Article %T In situ silica supported metallocene catalysts for ethylen Polymerzation %A S Ahmadjo %A H. Arabi %A Zohuri, Gholamhossein %A G. Nejabat %A M Omidvar %A M. Ahmadi %A M. M. Mortazavi %J Journal of Petroleum Science and Technology %@ 2251-659X %D 2014