Gnasa, M., M. Won, and A. B. . Cremers. “Three Pillars for Congenial Web Searching – Continuous Evaluation for Enhancing Web Search Effectiveness”. Journal of Web Engineering, vol. 3, no. 3-4, Dec. 2004, pp. 252-80, https://journals.riverpublishers.com/index.php/JWE/article/view/6271.