Gordon Rice, Patrick A. Staley, Gerald Myerson, Robin Chapman. Angles with Rational Cosines: 10900. The American Mathematical Monthly, 110(7):639, 2003. [doi]
@article{RiceSMC03,
title = {Angles with Rational Cosines: 10900},
author = {Gordon Rice and Patrick A. Staley and Gerald Myerson and Robin Chapman},
year = {2003},
url = {http://www.jstor.org/stable/3647759},
researchr = {https://researchr.org/publication/RiceSMC03},
cites = {0},
citedby = {0},
journal = {The American Mathematical Monthly},
volume = {110},
number = {7},
pages = {639},
}