@article{AIHPA_1981__34_3_253_0,
     author = {Alvarez-Estrada, R. F.},
     title = {Rigorous approach to elastic meson-nucleon scattering in non-relativistic quantum field theory. {(I)} : integral equation and {Schr\"odinger} ket},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {253--276},
     publisher = {Gauthier-Villars},
     volume = {34},
     number = {3},
     year = {1981},
     mrnumber = {612218},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPA_1981__34_3_253_0/}
}