VILLANOVA-OLIVER, M. ., J. GENSEL, and H. . MARTIN. “A PROGRESSIVE ACCESS APPROACH FOR WEB-BASED INFORMATION SYSTEMS”. Journal of Web Engineering, vol. 2, no. 1-2, Feb. 2003, pp. 027-5, https://journals.riverpublishers.com/index.php/JWE/article/view/4375.