Chica-Urzola, Juan Ángel, and Ciro Alfonso Serna Mendoza. “A New Harmonic Polyhedral Structure Based in Life and Well-Being As Framework to Solve the Main Problem of the Sustainable Development”. European Journal of Sustainable Development 7, no. 4 (October 1, 2018): 391. Accessed April 28, 2024. http://ojs.ecsdev.org/index.php/ejsd/article/view/717.