%0 Journal Article %A Š. Znám %T Two improvements of a result concerning a problem of K. Zarankiewicz %J Colloquium Mathematicum %D 1964 %P 255-258 %V 13 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-13-2-255-258/ %R 10.4064/cm-13-2-255-258 %G en %F 10_4064_cm_13_2_255_258