Akihiro Tatsumi, Masashi Okubo. Influence of Presence of Operator of Humanoid Robot on Personal Space. In Masaaki Kurosu, editor, Human-Computer Interaction. Perspectives on Design - Thematic Area, HCI 2019, Held as Part of the 21st HCI International Conference, HCII 2019, Orlando, FL, USA, July 26-31, 2019, Proceedings, Part I. Volume 11566 of Lecture Notes in Computer Science, pages 340-357, Springer, 2019. [doi]