@book{30187,
	author = {Beem, John K. and Ehrlich, Paul.},
	title = {Global lorentzian geometry /},
	publisher = {CRC Press,},
	year = {1996.},
	series = {Chapman & hall/crc pure and applied mathematics.},
	address = {[S.l.] :},
	edition = {2nd ed.}
}