@article{AIHPA_1987__47_4_383_0,
     author = {Bachelot, Alain and Petkov, Vesselin},
     title = {Existence des op\'erateurs d'ondes pour les syst\`emes hyperboliques avec un potentiel p\'eriodique en temps},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {383--428},
     publisher = {Gauthier-Villars},
     volume = {47},
     number = {4},
     year = {1987},
     mrnumber = {933684},
     zbl = {0657.35102},
     language = {fr},
     url = {http://www.numdam.org/item/AIHPA_1987__47_4_383_0/}
}