@article{AIHPA_1964__1_1_55_0,
     author = {Joachain, C.},
     title = {Traitement variationnel de collisions atomiques},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {55--77},
     publisher = {Gauthier-Villars},
     volume = {1},
     number = {1},
     year = {1964},
     mrnumber = {189651},
     language = {fr},
     url = {http://archive.numdam.org/item/AIHPA_1964__1_1_55_0/}
}