@book{9531,
	author = {Kovalevsky, Jean, and COSPAR.},
	title = {Trajectories of artificial celestial bodies, as determined from observations : },
	publisher = {Springer-Verlag,},
	year = {1966.},
	address = {New York,},
	note = {At head of title: COSPAR-IAU-IUTAM.}
}