@article{1028998768,
author = {Knobloch, H.-W.},
title = {An existence theorem for periodic solutions of nonlinear ordinary differential equations.},
journal = {Michigan Math. J.},
volume = {9},
number = {1},
year = {1962},
pages = { 303-309},
language = {en},
url = {http://dml.mathdoc.fr/item/1028998768}
}
Knobloch, H.-W. An existence theorem for periodic solutions of nonlinear ordinary differential equations.. Michigan Math. J., Tome 9 (1962) no. 1, pp. 303-309. http://gdmltest.u-ga.fr/item/1028998768/