1. Min, W.: The Study of Natural Interaction of Chinese Calligraphy Techniques in Digital Terminal. Beijing University of Posts and Telecommunications, Beijing (2013). (in Chinese)
2. Gong, W.: Design and research for virtual reality sand play therapy based on HTC VIVE. Harbin Institute of Technology (2016)
3. Zhang, M.: The research on sand play therapy design based on spatial augmented reality and its user experience. Harbin Institute of Technology (2014)
4. Huang, X., Dong, H.: Depth-based real-time hand gesture recognition and virtual writing systems. Comput. Eng. Appl. 167–173 (2015)
5. Zhang, J.: Innovative application of virtual display technique in virtual museum. Mater. Sci. Eng. (2017)