@article{AIHPA_1984__40_2_117_0,
     author = {Combes, J. M. and Tip, A.},
     title = {Properties of the scattering amplitude for electron-atom collisions},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {117--139},
     publisher = {Gauthier-Villars},
     volume = {40},
     number = {2},
     year = {1984},
     mrnumber = {747197},
     zbl = {0583.47014},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPA_1984__40_2_117_0/}
}