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3. Richard Haberkern. 2017. Soundlazer. https://www.kickstarter.com/projects/richardhaberkern/soundlazer Richard Haberkern. 2017. Soundlazer. https://www.kickstarter.com/projects/richardhaberkern/soundlazer
4. Holosonics. 2022. Audio spotlight as-24ix. https://www.holosonics.com/audio-spotlight-24ix Holosonics. 2022. Audio spotlight as-24ix. https://www.holosonics.com/audio-spotlight-24ix
5. In the Zone! — Controlling and Visualising Sound Zones