@article{1077467623,
author = {Friedman, Avner},
title = {Oscillatory solutions of nonlinear autonomous differential
equations of order higher than two},
journal = {Duke Math. J.},
volume = {24},
number = {1},
year = {1957},
pages = { 561-566},
language = {en},
url = {http://dml.mathdoc.fr/item/1077467623}
}
Friedman, Avner. Oscillatory solutions of nonlinear autonomous differential
equations of order higher than two. Duke Math. J., Tome 24 (1957) no. 1, pp. 561-566. http://gdmltest.u-ga.fr/item/1077467623/