J. A. Delgado Arias and D. E. . Ramírez-Ospina, “Informal Labor in the Capital Cities of the Colombian Coffee Region: an Analysis through the Probabilistic Models for Year 2019”, Semest. Econ., vol. 24, no. 57, pp. 171–189, May 2022, doi: 10.22395/seec.v24n57a8.