Espinoza Lastra, O. R. ., . L. E. . Álvarez Cortez, D. A. . Ipiales Espín, and B. E. . Ramírez Rodríguez. “Neutrosophic Multicriteria Methods and PESTEL Analysis for the Evaluation of Informal Trade Impact”. Neutrosophic Sets and Systems, vol. 44, Aug. 2021, pp. 367-7, https://fs.unm.edu/NSS2/index.php/111/article/view/2713.