%0 Journal Article %A Zelinka, Bohdan %T Polar graphs and railway traffic %J Applications of Mathematics %D 1974 %P 169-176 %V 19 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/AM.1974.103527/ %R 10.21136/AM.1974.103527 %G en %F 10_21136_AM_1974_103527