@article{10_4064_cm_3_1_50_57,
     author = {T. K\'ovari and V. S\'os and P. Tur\'an},
     title = {On a problem of {K.} {Zarankiewicz}},
     journal = {Colloquium Mathematicum},
     pages = {50--57},
     publisher = {mathdoc},
     volume = {3},
     number = {1},
     year = {1954},
     doi = {10.4064/cm-3-1-50-57},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-3-1-50-57/}
}