@article{10_4153_CMB_1971_105_4,
     author = {Ponzo, Peter J.},
     title = {Periodic {Solutions} {For} ẋ = {Ax} + {G(x,} t) + \ensuremath{\in}p(t)},
     journal = {Canadian mathematical bulletin},
     pages = {575--577},
     year = {1971},
     volume = {14},
     number = {4},
     doi = {10.4153/CMB-1971-105-4},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1971-105-4/}
}