Morelos Gomez, Jose, et al. “Efficiency of the Productive Systems of Small and Medium Enterprises in the Department of Bolívar - Colombia”. Saber, Ciencia Y Libertad, vol. 17, no. 2, Aug. 2022, pp. 369-98, https://doi.org/10.18041/2382-3240/saber.2022v17n2.9298.