@book{7518,
	author = {Harnack, Axel, and Cathcart, George L.},
	title = {An introduction to the study of the elements of the differential and integral calculus /},
	publisher = {Williams and Norgate,},
	year = {1891.},
	address = {London :},
	note = {Tr. by George L. Cathcart.},
	url = {http://resolver.library.cornell.edu/math/1934329}
}