%0 Journal Article %A Ohriska, Ján %T Problems with one quarter %J Czechoslovak Mathematical Journal %D 2005 %P 349-363 %V 55 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMJ_2005__55_2_a5/ %G en %F CMJ_2005__55_2_a5