%0 Journal Article
%A K. Radziszewski
%T π-geodesics and lines of shadow
%J Colloquium Mathematicum
%D 1972
%P 157-163
%V 26
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/cm-26-1-157-163/
%R 10.4064/cm-26-1-157-163
%G en
%F 10_4064_cm_26_1_157_163