%0 Journal Article
%A Bolle, Philippe
%T Morse Index of Approximating Periodic Solutions for the Billiard Problem. Application to Existence Results
%J Canadian journal of mathematics
%D 1998
%P 497-524
%V 50
%N 3
%U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1998-027-6/
%R 10.4153/CJM-1998-027-6
%F 10_4153_CJM_1998_027_6