Ayu Anggraeni Sibarani, et al. “Multi-Item Flow Shop Batch Scheduling With Two Stages Dedicated Machines to Minimize Total Actual Flow Time”. International Journal of Integrated Engineering, vol. 17, no. 1, Apr. 2025, pp. 140-53, https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/14683.