%0 Journal Article
%A E. Grzegorek
%T A solution of a problem of B. Rotman
%J Colloquium Mathematicum
%D 1977
%P 37-38
%V 38
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/cm-38-1-37-38/
%R 10.4064/cm-38-1-37-38
%G en
%F 10_4064_cm_38_1_37_38