@book{7646,
	author = {International Astronomical Union Symposium and Chebotarev, G. A., ed. and International Astronomical Union },
	title = {The motion, evolution of orbits, and origin of comets},
	publisher = {D. Reidel Publishing},
	year = {1972},
	series = {IAU Symposium; no. 45},
	address = {Dordrecht},
	note = {Donated by Mrs. Bappu}
}