Bi-objective optimization modeling of a three-level supply chain in production planning and scheduling considering price-dependent demand: a case study of a soap factoryReyhaneh Eslami, Mehran Abedini, Mahsa Zokaee, Masoud Rabbani and Amir AghsamiRAIRO-Oper. Res., 58 6 (2024) 4997-5028DOI: https://doi.org/10.1051/ro/2024197