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@article{10_4064_cm_56_1_147_151, author = {Ryszard Grz\k{a}\'slewicz}, title = {Extreme symmetric norms on $R^2$}, journal = {Colloquium Mathematicum}, pages = {147--151}, publisher = {mathdoc}, volume = {56}, number = {1}, year = {1988}, doi = {10.4064/cm-56-1-147-151}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-56-1-147-151/} }
Ryszard Grząślewicz. Extreme symmetric norms on $R^2$. Colloquium Mathematicum, Tome 56 (1988) no. 1, pp. 147-151. doi : 10.4064/cm-56-1-147-151. http://geodesic.mathdoc.fr/articles/10.4064/cm-56-1-147-151/
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