User study of the improved Helios voting system interfaces. - Fatih Karayumak; Michaela Kauer; Maina M. Olembo; Tobias Volk; Melanie Volkamer (STAST, 2011)

Usability Analysis of Helios - An Open Source Verifiable Remote Electronic Voting System. - Fatih Karayumak; Maina M. Olembo; Michaela Kauer; Melanie Volkamer (EVT/WOTE, 2011)

Contextualized Web Warnings, and How They Cause Distrust. - Steffen Bartsch; Melanie Volkamer; Heike Theuerling; Fatih Karayumak (TRUST, 2013)