Zapata Cebrián, Héctor. “Development of Multi-User Virtual Reality Communication and Collaboration Spaces for E-Learning Platforms. Case Study: Obicex Foundation”. Doxa Comunicación. Interdisciplinary Journal of Communication Studies and Social Sciences, no. 33, Dec. 2021, p. 428, https://revistascientificas.uspceu.com/doxacomunicacion/article/view/1536.