@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/}
}