CRISTOBAL COAGUILA BERLY DAVID; BARRIGA PARIA CHRIST JESUS. Optimization of the Health and Safety Protocol for Covid-19 through the use of the QR Code in the Tailing Disposal System Project, Quellaveco - Moquegua, 2020. International Journal of Engineering and Management Research, [S. l.], v. 11, n. 5, p. 129–142, 2021. DOI: 10.31033/ijemr.11.5.16. Disponível em: https://www.ijemr.net/ojs/index.php/ijemr/article/view/16. Acesso em: 1 dec. 2021.