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2021. On Additive Mapping with Period 3 on Rings and Near-Rings. Journal of Al-Rafidain University College For Sciences ( Print ISSN: 1681-6870 ,Online ISSN: 2790-2293 ). 42, 1 (Oct. 2021), 259–273. DOI:https://doi.org/10.55562/jrucs.v42i1.168.