%0 Journal Article %T Similarities and Differences of the Active Sites in Basic and Advanced MgCl2-Supported Ziegler-Natta Propylene Polymerization Catalysts %A Yuichi Hiraoka %A Sang Yull Kim %A Dashti, Ali %A Toshiaki Taniike %A Minoru Terano %J Macromolecular Reaction Engineering %@ 1862-832x %D 2010