%0 Journal Article %A Roch Cassanas %T A Gutzwiller type formula for a reduced Hamiltonian within the framework of symmetry %J Comptes Rendus. Mathématique %D 2005 %P 21-26 %V 340 %N 1 %I Elsevier %R 10.1016/j.crma.2004.11.013 %G en %F CRMATH_2005__340_1_21_0