Kathrin Pollmann, Selina Layer, Amelie Polosek, Boyu Xian, Anna Vorreuther. How Can Signs on Public Robots Prevent Robot Bullying: An Explorative Study about the Effects of Three Robot Communication Strategies on Subjective Perception, Visual Attention, and Bullying Tendencies of Passers-By in Public Spaces. In Lynne Baillie, William D. Smart, Maartje de Graaf, Matthew Gombolay, Ilaria Torre 0002, editors, Companion Proceedings of the 21st ACM/IEEE International Conference on Human-Robot Interaction, HRI Companion 2026, Edinburgh, Scotland, UK, March 16-19, 2026. pages 116-120, ACM, 2026. [doi]