@article{1102818224,
author = {Graef, John R.},
title = {Some nonoscillation criteria for higher order nonlinear differential equations.},
journal = {Pacific J. Math.},
volume = {67},
number = {2},
year = {1976},
pages = { 125-129},
language = {en},
url = {http://dml.mathdoc.fr/item/1102818224}
}
Graef, John R. Some nonoscillation criteria for higher order nonlinear differential equations.. Pacific J. Math., Tome 67 (1976) no. 2, pp. 125-129. http://gdmltest.u-ga.fr/item/1102818224/