An elementary proof of the Theorem of Beckmann and Quarles.
Elemente der Mathematik, Tome 42 (1987) no. 4, pp. 4-9
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ZblWalter Benz. An elementary proof of the Theorem of Beckmann and Quarles.. Elemente der Mathematik, Tome 42 (1987) no. 4, pp. 4-9. http://geodesic.mathdoc.fr/item/ELMA_1987__42_4_141394/
@article{ELMA_1987__42_4_141394,
author = {Walter Benz},
title = {An elementary proof of the {Theorem} of {Beckmann} and {Quarles.}},
journal = {Elemente der Mathematik},
pages = {4--9},
year = {1987},
volume = {42},
number = {4},
zbl = {0701.51013},
url = {http://geodesic.mathdoc.fr/item/ELMA_1987__42_4_141394/}
}