@article{AIHP_1961__17_2_129_0,
     author = {Guy, Roland},
     title = {Sur la forme int\'egrale de l'\'equation d'\'evolution d'un syst\`eme physique et ses solutions},
     journal = {Annales de l'institut Henri Poincar\'e},
     pages = {129--148},
     publisher = {INSTITUT HENRI POINCAR\'E ET GAUTHIER-VILLARS & Cie},
     volume = {17},
     number = {2},
     year = {1961},
     mrnumber = {131652},
     language = {fr},
     url = {http://archive.numdam.org/item/AIHP_1961__17_2_129_0/}
}