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@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}, publisher = {mathdoc}, volume = {42}, number = {4}, year = {1987}, zbl = {0701.51013}, url = {http://geodesic.mathdoc.fr/item/ELMA_1987__42_4_141394/} }
Walter 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/