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2021. Formation of an optimal investment portfolio of the common stocks by using the model of simple rating – an empirical study in the Iraqi stock exchange. Journal of Al-Rafidain University College For Sciences ( Print ISSN: 1681-6870 ,Online ISSN: 2790-2293 ). 26, 1 (Oct. 2021), 133–150. DOI:https://doi.org/10.55562/jrucs.v26i1.430.