@article {agarwal2007oscillation,
	title = {Oscillation criteria for fourth order nonlinear difference equations},
	year = {2007},
	note = {n/a},
	publisher = {Walter de Gruyter GmbH \& Co. KG},
	abstract = {n/a},
	author = {Agarwal, Ravi P and Said R. Grace and Akin-Bohner, ELVAN}
}
