1. (1) K. Miyata and M. Osima: “High-Profile VR/AR: the Background, Cases, and Educational Possibility Toward a VR/AR Education to Generate Awareness of Social Issues”, Aoyama Information Science, Vol. 43, No. 1, pp. 2-11 (2015) (in Japanese)
2. (2) SuperData: “VIRTUAL REALITY”, https://www.superdataresearch.com/data/
3. (5) T. Handa: “Development of a Haptic Device to Present Three-dimensional Shape and Hardness of a Virtual Object by Moving the Device in the Space”, The Journal of The Institute of Image Information and Television Engineers, Vol. 73, No. 1, pp. 161-166 (2019) (in Japanese)
4. (6) 3D SYSTEMS: “TOUCH”, https://ja.3dsystems.com/haptics-devices/touch
5. (7) force dimension: “omega. 7”, http://www.forcedimension.com/products/omega-7/overview