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@article{MOMA_1990__110_3-4_178499, author = {Ryszard Grzaslewicz}, title = {Extreme {Norms} on ...}, journal = {Monatshefte f\"ur Mathematik}, pages = {257--260}, publisher = {mathdoc}, volume = {110}, number = {3-4}, year = {1990}, url = {http://geodesic.mathdoc.fr/item/MOMA_1990__110_3-4_178499/} }
Ryszard Grzaslewicz. Extreme Norms on .... Monatshefte für Mathematik, Tome 110 (1990) no. 3-4, pp. 257-260. http://geodesic.mathdoc.fr/item/MOMA_1990__110_3-4_178499/