%0 Journal Article %A Zelinka, Bohdan %T Bases of classes of trees closed under subdivisions %J Mathematica slovaca %D 1980 %P 61-64 %V 30 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/MASLO_1980__30_1_a6/ %G en %F MASLO_1980__30_1_a6