GUERRERO, LUIS A., CÉSAR A. COLLAZOS, JOSÉ A. PINO, SERGIO F. OCHOA, and FELIPE AGUILERA. 2004. “DESIGNING VIRTUAL ENVIRONMENTS TO SUPPORT COLLABORATIVE WORK IN REAL SPACES”. Journal of Web Engineering 2 (4):282-94. https://journals.riverpublishers.com/index.php/JWE/article/view/4361.