Should a small robot have a small personal space? Investigating personal spatial zones and proxemic behavior in human-robot interaction. - Hagen Lehmann; Adam Rojik; Matej Hoffmann (CoRR, 2020)

Hey, Robot! An Investigation of Getting Robot's Attention Through Touch. - Hagen Lehmann; Adam Rojik; Kassandra Friebe; Matej Hoffmann (ICSR (1), 2022)