Bibliography: 1. Barrios Castillo, G. Y., & González Veiga, M. C. (2009). Procedure for the evaluation of efficiency. Cuba: Editorial Universitaria.
2. Rodríguez Mestre, L.; Reynaldo Argüelles, C. L.; Marreno Ancízar, Y.; & Peña Breffe, R. (2019). Territorial Contribution, alternative to mitigate negative externalities of nickel mining activity. ECAinergia,10(3), 1390−6623. DOI: 10.33936/eca_sinergia.v10i3.1846.
3. Economic and Commercial Office of Spain in Havana (2021). Economic and Trade Report. Retrieved from http://www.icex.es.
4. ECLAC (2020). Cuba-Macroeconomic Report. Economic Survey of Latin America and the Caribbean. Retrieved from http://repositorio.cepal.org.
5. Astorga, E. M., Rabelo, M. G., Valdés, Z. M. (2019). Towards the sustainable development of the Cuban nickel industry. Economía y Desarrollo, 162 (2), 1−14.
6. Energy transition: nickel helps combat climate change. (2018). Nickel, 33(1), 8.
7. CRU International Limited (2018). Characterization and analysis of international mineral market in the short, medium, and long term with validity to the year 2035. Mining and Energy Planning Unit. Santiago de Chile, Chile.
8. Guidelines of the Economic and Social Policy of the Party and the Revolution for the period 20162021 (July 2017). URL: https://www.pcc.cu/lineamientos (Access date: 10.02.2022).
9. Environmental Ethics to improve the country’s competitiveness in the framework of Porter’s hypothesis. URL: https://economiaambientalgt.wordpress.com/hipotesis-de-porter/ (Access date: 10.02.2022).
10. What are the Sustainable Development Goals? URL: https://www.undp.org/content/ undp/es/home/sustainable-development-goals.html (Access date: 10.02.2022).
11. Kao, C. (1994). Efficiency improvement in data envelopment analysis. European Journal of Operational Research, 73(3), 487−494.
12. Coelli, T., Prasada Rao, D. S. & Battese, G. E. (1998). An introduction to efficiency and productivity analysis. Kluwer Academic Publishers, Boston.
13. Marrero Ancízar, Y. & Ortiz Torres, M. (2019). The profile of Cuban trade negotiators and the evaluation of their technical efficiency. Havana, Editorial UH. ISBN: 978−959−7251−35−4.
14. Cancio-Díaz, Y., Barrios-Castillo, G. Y. (2010): Evaluation of the technical efficiency of the production of viands in the agricultural companies Benito Juárez and Osvaldo Herrera, in Observatory of the Latin American Economy, 128. Retrieved from http//www.eumed.net/ cursecon/ecolat/cu/2010/cdbc.htm.
15. Chaviano-Moreno, M.,Garcia-Fariñas, M., Muñiz-Cepero M., Sánchez-Delgado Z. (2007). Efficiency levels of polyclinics in Matanzas, Cuba, according to the Data Envelopment Analysis method. Pan American Journal of Public Health, Pan American Health Organization, 22 (2), 100−9. DOI: 10.1590/s1020−49892007000700004.
16. García-Fariñas, A., Nicolás-Pérez, R., Rodríguez-López, J., Sarria-Guerrero, D. (2008). The measurement of productive efficiency in Cuban polyclinics: a case study. Health economics, 120−129.
17. Rodríguez-Chile, I., García-Fariñas, A., García-Tapia, G. (2016). Technical efficiency of the clinics of the International Center for Neurological Restoration. URL: https://www. scielosp.org/pdf/rcsp/2016.v42n1/o3/es.
18. Montes de Oca-Quiñones, A. (2009). Measurement of efficiency in tourism activity through Data Envelopment Analysis. Turydes, 6(2).
19. Acosta-Cabrera, J. (2011). Data Envelopment Analysis (DEA) as a tool to measure efficiency in tourist entities: application in the points of sale of a five-star hotel in Havana City. Diploma work, Faculty of Economics, University of Havana.
20. Marrero-Ancízar, Y; Fernández, Y; Ortiz-Torres, M. (2012). Application of the Data Envelopment Analysis Methodology to measure the performance efficiency of the Cuban negotiator. Diploma work, Faculty of Economics, University of Havana.
21. Marrero-Ancízar, Y., Ramírez, A. S. (2012). Application of the Data Envelopment Analysis Methodology to measure the performance efficiency of Cuban negotiators. Diploma work, Faculty of Economics, University of Havana.
22. Marrero-Ancízar, Y., Pérez-Leyva, Y., Ortiz-Torres, M. (2013). Evaluation of the efficiency of the international trade negotiators of the company Quimimport through Data Envelopment Analysis. Diploma work, Faculty of Economics. University of Havana, Havana.
23. Marrero-Ancízar, Y., Mederos-Fornel, J. (2013). Evaluation of the efficiency in the performance of the negotiators in the company FARMACUBA. Diploma work, Faculty of Economics, University of Havana.
24. Marrero-Ancízar, Y., González-Díaz, C., Ortiz-Torres, M. (2013). Analysis of the performance efficiency of Cuban negotiators. Diploma work, Faculty of Economics, University of Havana.
25. Marrero Ancízar, Y. (2014). Procedure for the determination of the profile of Cuban trade negotiators and the evaluation of their technical efficiency. (Doctoral thesis). University of Havana, Havana, Cuba.
26. Guerrero, D. (2005). Mining indicators system for the sustainable exploitation of mineral resources. Retrieved from http://edunivlms.reduniv.edu.cu/items/show/27832.
27. Reynaldo, C. (2013). Procedure for economic and environmental valuation in nickel mining activity (Doctoral thesis). Instituto Superior Minero Metalúrgico de Moa, Cuba.
28. Rodríguez Mestre, L. (2020). Territorial Contribution: alternative to mitigate negative externalities of nickel mining and contribute to the local development of Moa. (Master’s degree Thesis). University of Moa, Cuba.