@article{ASNSP_1966_3_20_3_537_0,
     author = {G\'erard, R.},
     title = {Le th\'eor\`eme de {Floquet} pour les syst\`emes de la forme $dX = \left(\sum ^n_{k=1}P_k (t_1, t_2, \dots , t_n) \, dt_k\right) X $},
     journal = {Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche},
     pages = {537--541},
     publisher = {Scuola normale superiore},
     volume = {3e s{\'e}rie, 20},
     number = {3},
     year = {1966},
     zbl = {0149.05606},
     language = {fr},
     url = {http://archive.numdam.org/item/ASNSP_1966_3_20_3_537_0/}
}