@book{21623,
	author = {Heitler, Walter,},
	title = {The quantum theory of radiation /},
	publisher = {Clarendon Press,},
	year = {1954 [Reprinted 1957, 1966]},
	series = {The international series of monographs on physics},
	address = {Oxford :},
	edition = {3rd ed.}
}