@article{1077467213,
author = {Loud, W. S.},
title = {Boundedness and convergence of solutions of
$x''+cx'+g(x)=e(t)$},
journal = {Duke Math. J.},
volume = {24},
number = {1},
year = {1957},
pages = { 63-72},
language = {en},
url = {http://dml.mathdoc.fr/item/1077467213}
}
Loud, W. S. Boundedness and convergence of solutions of $x''+cx'+g(x)=e(t)$. Duke Math. J., Tome 24 (1957) no. 1, pp. 63-72. http://gdmltest.u-ga.fr/item/1077467213/