1.
Díaz Díaz RA, Verján Ávila DC, Vera Calderón JA. 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 [Internet]. Colombia,CO: Sello Editorial UNAD; 2022 [cited 2026 Nov. 2]. pp. 224-47. (Administrative, Accounting, Economic and Business). Available from: https://libros.unad.edu.co/index.php/selloeditorial/catalog/book/194/chapter/1376