@article {grace2008oscillation,
	title = {On the oscillation of certain fourth order functional differential equations},
	journal = {International Journal of Dynamical Systems and Differential Equations},
	volume = {1},
	number = {3},
	year = {2008},
	note = {n/a},
	pages = {155{\textendash}163},
	publisher = {Inderscience Publishers},
	abstract = {n/a},
	author = {Said R. Grace and Agarwal, Ravi P and Pavani, Raffaella and Manojlovic, Jelena V}
}
