Tim Hsu. Rational Nonaxis Points on the Unit Circle Have Irrational Angles. The American Mathematical Monthly, 123(5):490, 2016. [doi]
@article{Hsu16-19, title = {Rational Nonaxis Points on the Unit Circle Have Irrational Angles}, author = {Tim Hsu}, year = {2016}, url = {https://www.tandfonline.com/doi/abs/10.4169/amer.math.monthly.123.5.490}, researchr = {https://researchr.org/publication/Hsu16-19}, cites = {0}, citedby = {0}, journal = {The American Mathematical Monthly}, volume = {123}, number = {5}, pages = {490}, }