Giacomo Prando summarizes the troubled history of the radian, a unit with the odd property of appearing and disappearing seemingly at will in dimensional formulas.
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Prando, G. A spectral unit. Nat. Phys. 16, 888 (2020). https://doi.org/10.1038/s41567-020-0997-3
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DOI: https://doi.org/10.1038/s41567-020-0997-3
