RODRÍGUEZ SEBASTIÁN, Alejandro. Cumbre y contracumbre Río+20. Boletín CF+S, [S. l.], n. 52/53, p. 237–240, 2014. Disponível em: https://polired.upm.es/index.php/boletincfs/article/view/2772. Acesso em: 6 dec. 2025.