فهرس المقالات S. Kordrostami‎‎ المقاله 1 - Evaluating the Efficiency of Firms with Negative Data in Multi-Period Systems: An Application to Bank Data S. Kordrostami‎‎ M. Jahani Sayyad ‎Noveiri International Journal of Industrial Mathematics , العدد 1 , السنة 9 , زمستان 2017