@article{Kumagai2017, author = "Kota Kumagai and Satoshi Hasegawa and Yoshio Hayasaki", title = "{Visualization 1: Volumetric bubble display}", year = "2017", month = "4", url = "https://opticapublishing.figshare.com/articles/media/Visualization_1_Volumetric_bubble_display/4922759", doi = "10.1364/OPTICA.4.000298.v001" }