@article{1250130477,
author = {Lovelady, David Lowell},
title = {Some oscillation criteria for fourth order differential equations},
journal = {Rocky Mountain J. Math.},
volume = {5},
number = {4},
year = {1975},
pages = { 593-600},
language = {en},
url = {http://dml.mathdoc.fr/item/1250130477}
}
Lovelady, David Lowell. Some oscillation criteria for fourth order differential equations. Rocky Mountain J. Math., Tome 5 (1975) no. 4, pp. 593-600. http://gdmltest.u-ga.fr/item/1250130477/