@book{247207,
	author = {Henderson, Johnny, and Luca, Rodica,},
	title = {Boundary value problems for systems of differential, difference and fractional equations : positive solutions / },
	publisher = {Elsevier,},
	year = {2016.},
	address = {Amsterdam :},
	url = {http://www.sciencedirect.com/science/book/9780128036525}
}