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Karayumak, Faith; Kauer, Michaela; Olembo, Maina M.; Volk, Tobias; Volkamer, Melanie (2011). "User study of the improved Helios voting system interfaces". 2011 1st Workshop on Socio-Technical Aspects in Security and Trust (STAST). pp. 37–44. doi:10.1109/STAST.2011.6059254. ISBN978-1-4577-1183-1. S2CID14652825.