@article{ELMA_1978__33_141210,
     author = {Murray Silver},
     title = {On the constructibility of rational angles.},
     journal = {Elemente der Mathematik},
     pages = {42--44},
     publisher = {mathdoc},
     volume = {33},
     year = {1978},
     zbl = {0382.51008},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1978__33_141210/}
}