1. Abalkin, V.K., Aksenov, E.P., Grebennikov, E.A., et al., Spravochnoe rukovodstvo po nebesnoi mekhanike i astrodinamike (Handbook on Celestial Mechanics and Astrodynamics), Moscow: Naika, 1976.
2. Carusi, A. and Valsecchi, G., Planetary Close Encounters: Importance of Nearly Tangent Orbits, Moon Planets, 1980, no. 22, pp. 113–124.
3. Carusi, A., Kresak, L., and Valsecchi, G.B., Atlas of Orbital Patterns at Close Encounters, Italia: Instituto of astrofisica spaziale, 1981.
4. Carusi, A., Kresakova, M., and Valsecchi, G.B., Perturbations by Jupiter of the Particles Ejected from Comet Lexell, Astron. Astrophys., 1982, no. 116, pp. 201–209.
5. Chambers, J.E., A Hybrid Symplectic Integrator that Permits Close Encounters between Massive Bodies, Mon. Notic. Roy. Astron. Soc., 1999, vol. 304, pp. 793–799.