@article{1183496402,
author = {Fite, W. B.},
title = {Periodic solutions of linear differential equations},
journal = {Bull. Amer. Math. Soc.},
volume = {38},
number = {12},
year = {1932},
pages = { 865-871},
language = {en},
url = {http://dml.mathdoc.fr/item/1183496402}
}
Fite, W. B. Periodic solutions of linear differential equations. Bull. Amer. Math. Soc., Tome 38 (1932) no. 12, pp. 865-871. http://gdmltest.u-ga.fr/item/1183496402/