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@article{10_4064_cm_50_2_241_248, author = {A. Schinzel}, title = {A non-standard metric in the group of reals}, journal = {Colloquium Mathematicum}, pages = {241--248}, publisher = {mathdoc}, volume = {50}, number = {2}, year = {1985}, doi = {10.4064/cm-50-2-241-248}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-50-2-241-248/} }
A. Schinzel. A non-standard metric in the group of reals. Colloquium Mathematicum, Tome 50 (1985) no. 2, pp. 241-248. doi : 10.4064/cm-50-2-241-248. http://geodesic.mathdoc.fr/articles/10.4064/cm-50-2-241-248/
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