Dvorak, R.. ”The long term evolution of Atens and Apollos”. Evolution and source regions of asteroids and comets : proceedings of the 173rd colloquium of the International Astronomical Union, held in Tatranska Lomnica, Slovak Republic, August 24-28, 1998 / edited by J. Svoren, E.M. Pittich, H. Rickman. Tatranska Lomnica, Slovak Republic : Astronomical Institute of the Slovak Academy of Sciences, 1999., p.59. http://adsabs.harvard.edu/full/1999esra.conf...59D. Läst 6 februari 2009.