@book{51004,
	author = {Sommerville, Duncan M'Laren Young,},
	title = {Analytical conics /},
	publisher = {G Bell and Sons,},
	year = {1933 [Reprinted 1951]},
	series = {Bell's mathematical series. Advanced section},
	address = {London :},
	edition = {3rd ed. rev.},
	note = {Includes index.}
}