TY - JOUR AU - Médan, Christine TI - On Critical Level Sets of Some two Degrees of Freedom Integrable Hamiltonian Systems JO - Canadian journal of mathematics PY - 1998 SP - 134 EP - 151 VL - 50 IS - 1 UR - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1998-007-7/ DO - 10.4153/CJM-1998-007-7 ID - 10_4153_CJM_1998_007_7 ER -