@book{11059,
	author = {Meeting on the Gravitational Force Perpendicular to the Galactic Plane and Davis Philip, A. G., ed. and Van Vleck Observatory },
	title = {The gravitational force perpendicular to the galactic plane},
	publisher = {L. Davis Press},
	year = {1989},
	series = {Van Vleck observatory contribution; no. 9},
	address = {New York}
}