Lenis Freire, Natalia Maria. “Proposal to Improve the Billing Process in a Service Company Underthe Implementation of the A3 Tool”. Ingeniería Solidaria 19, no. 2 (May 1, 2023): 1–22. Accessed July 3, 2024. https://revistas.ucc.edu.co/index.php/in/article/view/4462.