@book{154985,
	author = {Jeffreys, Harold. and Jeffreys, Bertha Swirles.},
	title = {Methods of mathematical physics /},
	publisher = {Cambridge University Press,},
	year = {1988.},
	address = {London :},
	edition = {3rd ed., reprinted 1988.},
	note = {Includes index.}
}