Valderrama-Balaguera, Juan Camilo, et al. “Application of the Lean Six Sigma Model in Higher Education Institutions in the Process of Admissions and Registration: Case Study”. Mundo FESC Journal, vol. 11, no. s4, Nov. 2021, pp. 241-60, https://www.fesc.edu.co/Revistas/OJS/index.php/mundofesc/article/view/966.