@article {219001,
	title = {Semipositone higher-order differential equations},
	journal = {Applied Mathematics Letters},
	volume = {17},
	year = {2004},
	note = {n/a},
	pages = {201-207},
	publisher = {Pergamon},
	abstract = {n/a},
	isbn = {0893-9659},
	author = {Agarwal, Ravi P and Said R. Grace and O{\textquoteright}regan, Donal}
}
