[1] [PDF] The Design Space for Robot Appearance and Behaviour for Social ... https://uhra.herts.ac.uk/id/eprint/16112/1/MLWaltersPhDThesis-Final.pdf
[2] The relationship between robot size and psychological threat https://tohoku.elsevierpure.com/en/publications/are-bigger-robots-scary-the-relationship-between-robot-size-and-p/
[3] [PDF] The Influence of Height in Robot-Mediated Communication https://pages.cs.wisc.edu/~bilge/pubs/2013/HRI13-Rae.pdf
[4] Factors Influencing The Human Preferred Interaction Distance https://rrl.cse.unr.edu/media/documents/2019/Factors_Influencing_the_human_preferred_interaction_distance_Roman_19_final.pdf
[5] The Impact of a Robotic Object on Human Compliance - arXiv https://arxiv.org/html/2509.16032v1
[6] On 'Grapeshot and Grenadiers': An Engineering Primer https://researchcentre.army.gov.au/library/land-power-forum/grapeshot-and-grenadiers-engineering-primer
[7] Safety Systems and Fault Tolerance: Emergency Stop, Collision Detection, and Safe Failure Modes for Humanoid Robots - Stabilarity Hub https://hub.stabilarity.com/safety-systems-and-fault-tolerance-emergency-stop-collision-detection-and-safe-failure-modes-for-humanoid-robots/