GUERRERO, L. A. ., C. A. COLLAZOS, J. A. . PINO, S. F. . OCHOA, and F. . AGUILERA. “DESIGNING VIRTUAL ENVIRONMENTS TO SUPPORT COLLABORATIVE WORK IN REAL SPACES”. Journal of Web Engineering, vol. 2, no. 4, Oct. 2004, pp. 282-94, https://journals.riverpublishers.com/index.php/JWE/article/view/4361.