1. Ko, B. (2018). A brief review of facial emotion recognition based on visual information. sensors, 18(2), 401.
2. Carroll, J. M., & Kjeldskov, J. (2013). The encyclopedia of human-computer interaction. 2nd. Ed. Interaction Design Foundation.
3. Huang, W. (2015). When HCI Meets HRI: the intersection and distinction.
4. Fong, T., Nourbakhsh, I., & Dautenhahn, K. (2003). A survey of socially interactive robots. Robotics and autonomous systems, 42(3-4), 143-166.