@article {grace1999oscillation,
	title = {Oscillation criteria for certain second order nonlinear difference equations},
	journal = {Bulletin of the Australian Mathematical Society},
	volume = {60},
	number = {1},
	year = {1999},
	note = {n/a},
	pages = {95{\textendash}108},
	publisher = {Cambridge University Press},
	abstract = {n/a},
	author = {Grace, SR and El-Morshedy, HA}
}
