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@article{10_21136_CPM_1957_117281, author = {Pt\'ak, Vlastimil}, title = {O jedn\'e ot\'azce z teorie aproximac{\'\i}}, journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky}, pages = {458}, publisher = {mathdoc}, volume = {082}, number = {4}, year = {1957}, doi = {10.21136/CPM.1957.117281}, language = {cs}, url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1957.117281/} }
Pták, Vlastimil. O jedné otázce z teorie aproximací. Časopis pro pěstování matematiky, Tome 082 (1957) no. 4, p. 458. doi : 10.21136/CPM.1957.117281. http://geodesic.mathdoc.fr/articles/10.21136/CPM.1957.117281/
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