Near Earth objects, our celestial neighbors : opportunity and risk : proceedings of the 236th Symposium of the International Astronomical Union held in Prague, Czech Republic August 14-18, 2006 /
International Astronomical Union.Symposium(236th :2006 :Prague, Czech Republic)
Milani, Andrea.
Valsecchi, Giovanni B.(Giovanni Battista),1951-
Vokrouhlický, David.
Cambridge : Cambridge University Press,
2007.
Includes bibliographical references and index.
Near-earth asteroids
Comets