@article{AIHPA_1972__17_3_221_0,
     author = {Le Guillou, J. C. and Basdevant, J. L.},
     title = {Crossing and experimental $\pi \pi $ {S} and {P} waves},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {221--226},
     publisher = {Gauthier-Villars},
     volume = {17},
     number = {3},
     year = {1972},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1972__17_3_221_0/}
}