%0 Journal Article %T Copolymerization of ethylene-propylene using High – Activity Bi-supported Ziegler-Natta TiCl Catalys %A GH. Zohuri, M. Mortazavi, R. Jamjah, S. Ahmadjo %A Zohuri, Gholamhossein %J Journal of Applied Polymer Science %@ 0021-8995 %D 2004