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