Díaz Díaz, R. A., Verján Ávila, D. C., & Vera Calderón, J. A. (2022). Analysis of international trade of the department of Tolima: Application of the gravity model in the period 2009-2019. In Challenges and Trends for the Sustainability of Organizations in Scenarios of Uncertainty (pp. 224-247). Sello Editorial UNAD. https://doi.org/10.22490/9789586518352.10