Optimal configuration design for a multi –stage system model. Journal of Al-Rafidain University College For Sciences ( Print ISSN: 1681-6870 ,Online ISSN: 2790-2293 ), [S. l.], v. 25, n. 2, p. 185–204, 2021. DOI: 10.55562/jrucs.v25i2.456. Disponível em: https://jrucs.iq/index.php/JAUCS/article/view/456. Acesso em: 13 may. 2026.