Céspedes, Nikita, and Nelson Ramírez-Rondán. “Total Factor Productivity Estimation in Peru: Primal and Dual Approaches”. Economia 37, no. 73 (August 25, 2014): 9-29. Accessed April 19, 2024. https://revistas.pucp.edu.pe/index.php/economia/article/view/10082.