Pintaric, T., Kment, T., & Spreicer, W. (2008). SqueezeOrb: A Low-Cost Pressure-Sensitive User Input Device. In Proceedings of the 2008 ACM symposium on Virtual reality software and technology - VRST ’08 (pp. 269–270). ACM Press. https://doi.org/10.1145/1450579.1450647