A qualitative evaluation of suppliers in a supply network using Six Sigma criterion. - Hamed Fazlollahtabar; Hamed Hajmohammadi; Ali Khadem (Int. J. Appl. Decis. Sci., 2012)

Supplier selection and order allocation with process performance index in supply chain management. - Madjid Tavana; Hamed Fazlollahtabar; Hamed Hajmohammadi (Int. J. Inf. Decis. Sci., 2012)