@article {219022,
	title = {Oscillation theorems for fourth order functional differential equations},
	journal = {Journal of applied mathematics and computing},
	volume = {30},
	year = {2009},
	note = {n/a},
	pages = {75-88},
	publisher = {Springer},
	abstract = {n/a},
	isbn = {1865-2085},
	author = {Said R. Grace and Agarwal, Ravi P and John R. Graef}
}
