@article{AIHPA_1976__24_1_31_0,
     author = {Voros, A.},
     title = {Semi-classical approximations},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {31--90},
     publisher = {Gauthier-Villars},
     volume = {24},
     number = {1},
     year = {1976},
     mrnumber = {420747},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AIHPA_1976__24_1_31_0/}
}