@article{CRMATH_2005__340_1_21_0,
     author = {Cassanas, Roch},
     title = {A {Gutzwiller} type formula for a reduced {Hamiltonian} within the framework of symmetry},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {21--26},
     publisher = {Elsevier},
     volume = {340},
     number = {1},
     year = {2005},
     doi = {10.1016/j.crma.2004.11.013},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2004.11.013/}
}