@article{AIHPA_1987__47_1_1_0,
     author = {Hagedorn, George A.},
     title = {High order corrections to the time-independent {Born-Oppenheimer} approximation. - {I.} {Smooth} potentials},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {1--16},
     publisher = {Gauthier-Villars},
     volume = {47},
     number = {1},
     year = {1987},
     zbl = {0621.41012},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1987__47_1_1_0/}
}