@article {grace2008oscillation,
	title = {Oscillation theorems for certain fourth order nonlinear difference equations},
	journal = {International Journal of Difference Equations},
	volume = {3},
	number = {1},
	year = {2008},
	note = {n/a},
	pages = {71{\textendash}86},
	publisher = {Research India Publications},
	abstract = {n/a},
	author = {Said R. Grace and Agarwal, Ravi P and Pavani, Raffaella and Thandapani, E and others}
}
