@book{Jeffreys:1956:MMP,
author = {Jeffreys, Harold and Jeffreys, Bertha Swirles},
title = {Methods of Mathematical Physics},
edition = {3rd},
note = {Reprinted in 1999.},
publisher = {Cambridge University Press},
address = {Cambridge},
year = {1956},
mrclass = {27.0X},
mrnumber = {MR0074466 (17,590c)},
zblno = {0070.40402}}