Herrera, Santiago. “Notes on the Existence of a Unitary Root in the Colombian peso’s Series of Real Exchange Rate”. Estudios Económicos de El Colegio de México 5, no. 1 (January 1, 1990): 157–171. Accessed April 18, 2024. https://estudioseconomicos.colmex.mx/index.php/economicos/article/view/330.