TY  - JOUR
AU  - Hiroshi Matano
AU  - Paul H. Rabinowitz
TI  - On the necessity of gaps
JO  - Journal of the European Mathematical Society
PY  - 2006
SP  - 355
EP  - 373
VL  - 8
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4171/jems/57/
DO  - 10.4171/jems/57
ID  - JEMS_2006_8_2_a15
ER  -