%0 Journal Article
%A Röschel, Otto
%T Double points on characteristics
%J Applications of Mathematics
%D 1995
%P 381-390
%V 40
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.21136/AM.1995.134301/
%R 10.21136/AM.1995.134301
%G en
%F 10_21136_AM_1995_134301