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@article{10_14708_cm_v12i1_5640, author = {Z. Cybertowic}, title = {On some approximation problems}, journal = {Commentationes Mathematicae}, pages = { 61--74}, publisher = {mathdoc}, volume = {12}, number = {1}, year = {1968}, doi = {10.14708/cm.v12i1.5640}, language = {pl}, url = {http://geodesic.mathdoc.fr/articles/10.14708/cm.v12i1.5640/} }
Z. Cybertowic. On some approximation problems. Commentationes Mathematicae, Tome 12 (1968) no. 1, pp. 61-74. doi : 10.14708/cm.v12i1.5640. http://geodesic.mathdoc.fr/articles/10.14708/cm.v12i1.5640/
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