1. Analytische auflösung der Kepler'schen aufgabe;Bessel,1819
2. Debiased orbital and absolute magnitude distribution of the near-earth objects;Bottke;Icarus,2002
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4. Application of photometric models to asteroids;Bowell,1989
5. Bowell, E. (2015), The Asteroid Orbital Element Database, produced under funding by NASA grant NAG5-4741 and the Lowell observatory, file: astorb.dat, url: ftp://ftp.lowell.edu/pub/elgb/astorb.html, (downloaded at 10/11/2015).