@article {agarwal2007oscillation,
	title = {Oscillation of certain fourth order functional differential equations},
	journal = {Український математичний журнал},
	year = {2007},
	note = {n/a},
	publisher = {Інститут математики НАН України},
	abstract = {n/a},
	author = {Agarwal, RP and Grace, SR and O{\textquoteright}Regan, D}
}
