@book{10502,
	author = {Robertson, H. P. and Noonan, Thomas W.,},
	title = {Relativity and cosmology},
	publisher = {Saunders,},
	year = {1968.},
	address = {Philadelphia :},
	note = {Based on Robertson's notes for his relativity course at Caltech from 1949 to 1961.}
}