1. Fujitsu develops glove-style wearable device. http://www.fujitsu.com/global/about/resources/news/press-releases/2014/0218-01.html. Accessed 11 Jan 2021
2. Ring-type wearable device enables users to write in the air with finger. https://journal.jp.fujitsu.com/en/2015/02/10/01/. Accessed 11 Jan 2021
3. Ring zero. https://logbar.jp/en/index.html. Accessed 11 Jan 2021
4. Zhang, Y., Zhou, J., Laput, G., Harrison, C.: SkinTrack: using the body as an electrical waveguide for continuous finger tracking on the skin. http://www.gierad.com/assets/skintrack/skintrack.pdf. Accessed 11 Jan 2021
5. Wong, P., Zhu, K., Fu, H.: FingerT9: leveraging thumb-to-finger interaction for same-side-hand text entry on smartwatches. In: Proceedings of CHI 2018, Paper No. 178 (2017)