Amir Hossein Ghapanchi Mohammad Hamed Jafarzadeh Mohammad Hossein Khakbaz An Application of Data Envelopment Analysis (DEA) for ERP System Selection: Case of a Petrochemical Company. 77 2008 ICIS http://aisel.aisnet.org/icis2008/77 conf/icis/2008 db/conf/icis/icis2008.html#GhapanchiJK08