Espinosa Guillen, S. and Fierros Pesqueira, E. 2025. Empirical Evidence of CO2 Emissions Eco-Efficiency of 19 Companies Included in the S&P/BMV IPC Index in April 2021. Ágora de Heterodoxias. 11, 1 (Feb. 2025), 46-70. DOI:https://doi.org/10.5281/zenodo.14888737.