%0 Journal Article
%A Hiroshi Matano
%A Paul H. Rabinowitz
%T On the necessity of gaps
%J Journal of the European Mathematical Society
%D 2006
%P 355-373
%V 8
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4171/jems/57/
%R 10.4171/jems/57
%F JEMS_2006_8_2_a15