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@article{10_21136_CPM_1978_108788, author = {Korec, Ivan}, title = {On a problem of {V.} {Pt\'ak}}, journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky}, pages = {365--379}, publisher = {mathdoc}, volume = {103}, number = {4}, year = {1978}, doi = {10.21136/CPM.1978.108788}, mrnumber = {512233}, zbl = {0429.26001}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1978.108788/} }
Korec, Ivan. On a problem of V. Pták. Časopis pro pěstování matematiky, Tome 103 (1978) no. 4, pp. 365-379. doi : 10.21136/CPM.1978.108788. http://geodesic.mathdoc.fr/articles/10.21136/CPM.1978.108788/
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