%0 Journal Article
%A Romero Fuster, Maria del Carmen
%A Ruas, Maria Aparecida Soares
%T Some stability questions concerning caustics for different propagation laws.
%J Portugaliae mathematica
%D 1994
%P 595-605
%V 51
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/PORMA_1994__51_4_47286/
%G en
%F PORMA_1994__51_4_47286