@article{10_4153_CJM_2004_047_6,
     author = {Rouleux, Michel},
     title = {Semi-classical {Integrability,} {Hyperbolic} {Flows} and the {Birkhoff} {Normal} {Form}},
     journal = {Canadian journal of mathematics},
     pages = {1034--1067},
     year = {2004},
     volume = {56},
     number = {5},
     doi = {10.4153/CJM-2004-047-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-2004-047-6/}
}