%0 Journal Article %T Practical and Theoretical Study on the α- Substituent Effect on α- Diimine Nickel (II) and Cobalt (II)- Based Catalysts for Polymerization of Ethylene 1 %A Mostafa Khoshsefat %A Beheshty, Narges %A Zohuri, Gholamhossein %A Saeid Ahmadjo %A Soleimanzadegan, Somayyeh %J Polymer Science - Series B %@ 1560-0904 %D 2016