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2021. Comparison Branch and Bound Algorithm with Trust Region Method for Solving Non-linear Bi-level Programming with Application. Journal of Al-Rafidain University College For Sciences ( Print ISSN: 1681-6870 ,Online ISSN: 2790-2293 ). 48, 1 (Sep. 2021), 1–14. DOI:https://doi.org/10.55562/jrucs.v48i1.33.