@book{40998,
	author = {Friedlander, F. G.},
	title = {The wave equation on a curved space-time /},
	publisher = {Cambridge University Press,},
	year = {1975.},
	address = {Cambridge [Eng.] ;},
	note = {Includes index.},
	url = {http://www.loc.gov/catdir/enhancements/fy1002/74014435-t.html}
}