Rodríguez García, J.M., Medina Cuellar, S.E. and Sánchez Jiménez, M.A. (2026) “Determination of the poverty threshold in Guanajuato: an innovative approach using Engel’s law and the second derivative criterion”, Acta Universitaria, 36, pp. 1–17. doi:10.15174/au.2026.4564.