%0 Journal Article
%A Ping-Fun Lam
%T Discrete and continuous flows of characteristic $O^±$
%J Fundamenta Mathematicae
%D 1976
%P 141-147
%V 92
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/fm-92-2-141-147/
%R 10.4064/fm-92-2-141-147
%G en
%F 10_4064_fm_92_2_141_147