@article {agarwal2007oscillatory,
	title = {Oscillatory behavior of fourth order nonlinear difference equations},
	journal = {NZJ Math},
	volume = {36},
	year = {2007},
	note = {n/a},
	pages = {101{\textendash}111},
	abstract = {n/a},
	author = {Agarwal, Ravi P and Said R. Grace and Wong, Patricia JY}
}
