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), pp. 46–70. doi:10.5281/zenodo.14888737.