TING, I.-H. ., C. KIMBLE, and D. . KUDENKO. “FINDING UNEXPECTED NAVIGATION BEHAVIOUR IN CLICKSTREAM DATA FOR WEBSITE DESIGN IMPROVEMENT”. Journal of Web Engineering, vol. 8, no. 1, Aug. 2009, pp. 071-92, https://journals.riverpublishers.com/index.php/JWE/article/view/4073.