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1. https://www.nature.com/articles/s41566-022-01013-y
2. https://www.optica-opn.org/home/articles/volume_33/december_2022/extras/toroidal_vortices_of_light/
3. https://www.optica-opn.org/home/articles/volume_33/december_2022/features/optics_in_2022/
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