@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://www.numdam.org/item/AIHPA_1984__40_2_117_0/} }