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Mansyuri, Umar and Panudju, Andreas Tri and Sitorus, Helena and Spalanzani, Widya and Nurhasanah, Nunung and Khaerudin, Dedy (2004) The Bi-level particle swarm optimization for joint pricing in a supply chain. International Journal of Advanced Computer Science and Applications (IJACSA), 15 (4). pp. 745-753. ISSN 2156-5570