Analyzing the Two-Phase Heterogeneous and Batch Service Queuing System with Breakdown in Two-Phases, Feedback, and Vacation. Baghdad Science Journal, Iraq, Baghdad, v. 21, n. 8, p. 2701, 2024. DOI: 10.21123/bsj.2024.9126. Disponível em: https://bsj.uobaghdad.edu.iq/index.php/BSJ/article/view/9126.. Acesso em: 24 jan. 2025.