@article {218955,
	title = {Forced oscillation of nth-order nonlinear differential equations},
	journal = {Applied Mathematics Letters},
	volume = {13},
	year = {2000},
	note = {n/a},
	pages = {53-57},
	publisher = {Elsevier},
	abstract = {n/a},
	isbn = {0893-9659},
	author = {Agarwal, Ravi P and Said R. Grace}
}
