%0 Journal Article
%A Ewa Ligocka
%T How to prove Fefferman's theorem without use of differential geometry
%J Annales Polonici Mathematici
%D 1981
%P 117-130
%V 39
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/ap-39-1-117-130/
%R 10.4064/ap-39-1-117-130
%G en
%F 10_4064_ap_39_1_117_130