1. Brouwer, D. and van Woerkom, A.J.J.(1950), Astron. Papers Am. Ephem. 13, part II, p. 81.
2. Cameron, A.G.W.(1979), “Asteroids”, T.Gehrels(ed.), Univ. Arizona Press, p. 992.
3. Delsemme, A.H.(1977), “Comets, Asteroids, Meteorites”, A.H. Delsemme(ed.), Univ. Toledo, Ohio, p. 575.
4. Gehrels, T. (1977), “Comets, Asteroids, Meteorites”, A.H. Delsemme(ed.), Univ. Toledo, Ohio, p. 324.
5. Gonczi, R. and Froeschlé, C. (1981), Cel. Mechanics 25, p. 271.