@article {219110,
	title = {On the oscillatory and asymptotic behavior of even order nonlinear differential equations with retarded arguments},
	journal = {Journal of Mathematical Analysis and Applications},
	volume = {137},
	year = {1989},
	note = {n/a},
	pages = {528-540},
	publisher = {Elsevier},
	abstract = {n/a},
	isbn = {0022-247X},
	author = {Grace, SR}
}
