@article{03764327, title = {On the periodic solutions of linear homogeneous systems of differential equations.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {5}, year = {1982}, pages = {305-309}, doi = {10.1155/S0161171282000283}, zbl = {0486.34023}, language = {en}, url = {http://dml.mathdoc.fr/item/03764327} }
Bose, A.K. On the periodic solutions of linear homogeneous systems of differential equations.. International Journal of Mathematics and Mathematical Sciences, Tome 5 (1982) pp. 305-309. doi : 10.1155/S0161171282000283. http://gdmltest.u-ga.fr/item/03764327/