Iwuji A, Okereke CU, Atuejide CO. A Meta-Goal Programming Model with Lexicographic Achievement Function for Multi-Product Systems. BJS [Internet]. 2020 Jan. 1 [cited 2025 Dec. 16];3(1):170– 179. Available from: https://www.bjs-uniben.org/index.php/home/article/view/30