Chiu, Y.-S. P., J.-H. Jhan, V. Chiu, and H.-H. Chang. “A Multi-Item Manufacturing System With an Outsourcer and Random Defective Items”. Journal of Applied Research and Technology, vol. 19, no. 4, Aug. 2021, pp. 364-78, doi:10.22201/icat.24486736e.2021.19.4.1123.