1. Evan Ackermann. 2016. Walmart and Five Elements Robotics Working on Robotic Shopping Cart: We like the idea of an autonomous shopping cart but getting it to work will be a challenge. https://spectrum.ieee.org/walmart-and-five-elements-robotics-working-on-robotic-shopping-cart
2. Christoph Bartneck, Tony Belpaeme, Friederike Eyssel, Takayuki Kanda, Merel Keijsers, and Selma Sabanovic. 2020. Mensch-Roboter-Interaktion. Carl Hanser Verlag GmbH & Co. KG, München.
3. HUMAN–ROBOT COLLABORATION: A SURVEY
4. The development of an autonomous service robot. Implementation: “Lucas”—The library assistant robot
5. Extended Self in a Digital World: Table 1.