KHATTARA, A.; CHERIF-KHETTAF, W. R.; MOSTEFAI, M. RETRACTED: An Efficient Metaheuristic Approach for the Multi-Period Technician Routing and Scheduling Problem. Engineering, Technology & Applied Science Research, Greece, v. 9, n. 5, p. 4718–4723, 2019. DOI: 10.48084/etasr.3091. Disponível em: https://www.etasr.com/index.php/ETASR/article/view/3091. Acesso em: 25 jan. 2022.