Serge Tabachnikov. The (Un)equal Tangents Problem. The American Mathematical Monthly, 119(5):398-405, 2012. [doi]
@article{Tabachnikov12,
title = {The (Un)equal Tangents Problem},
author = {Serge Tabachnikov},
year = {2012},
doi = {10.4169/amer.math.monthly.119.05.398},
url = {http://dx.doi.org/10.4169/amer.math.monthly.119.05.398},
researchr = {https://researchr.org/publication/Tabachnikov12},
cites = {0},
citedby = {0},
journal = {The American Mathematical Monthly},
volume = {119},
number = {5},
pages = {398-405},
}