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@article{10_4064_cm_7_2_155_160, author = {Vera S\'os}, title = {On a problem of {S.} {Hartman} about normal forms}, journal = {Colloquium Mathematicum}, pages = {155--160}, publisher = {mathdoc}, volume = {7}, number = {2}, year = {1959}, doi = {10.4064/cm-7-2-155-160}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-7-2-155-160/} }
Vera Sós. On a problem of S. Hartman about normal forms. Colloquium Mathematicum, Tome 7 (1959) no. 2, pp. 155-160. doi : 10.4064/cm-7-2-155-160. http://geodesic.mathdoc.fr/articles/10.4064/cm-7-2-155-160/
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