Social influence of a persuasive agent: the role of agent embodiment and evaluative feedback. - Suzanne Vossen; Jaap Ham; Cees J. H. Midden (PERSUASIVE, 2009)

What Makes Social Feedback from a Robot Work? Disentangling the Effect of Speech, Physical Appearance and Evaluation. - Suzanne Vossen; Jaap Ham; Cees J. H. Midden (PERSUASIVE, 2010)