%0 Journal Article
%A Havel, Václav
%T Free extensions of $(a,b)$-systems
%J Czechoslovak Mathematical Journal
%D 1970
%P 353-356
%V 20
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1970.100972/
%R 10.21136/CMJ.1970.100972
%G en
%F 10_21136_CMJ_1970_100972