%0 Journal Article %A A. Sokolov %A A. M. Raigorodskiy %T On rational analogs of Nelson--Hadwiger's and Borsuk's problems %J Čebyševskij sbornik %D 2018 %P 270-281 %V 19 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/CHEB_2018_19_3_a21/ %G ru %F CHEB_2018_19_3_a21