Elizabeth Stobert, Alain Forget, Sonia Chiasson, Paul C. van Oorschot, Robert Biddle. Exploring usability effects of increasing security in click-based graphical passwords. In Carrie Gates, Michael Franz, John P. McDermott, editors, Twenty-Sixth Annual Computer Security Applications Conference, ACSAC 2010, Austin, Texas, USA, 6-10 December 2010. pages 79-88, ACM, 2010. [doi]