1. Aumann, H.H.: 1985,’Protoplanetaiy material around nearby stars’, in The search for extraterrestrial life: recent developments, ed. M. Papagiannis (Reidel), pp. 43–50.
2. Belyaev, N.A., Kresak, L., Pittich, EM.., Pushkarev, A.N.: 1986, Catalogue of short-period comets, Slovak Acad.Sci. Bratislava.
3. Benest, D.: 1971,’Elliptic Restricted Problem for Sun-Jupiter: Existence of Stable Retrograde Satellites at Large Distance.’, Astron.Astrophys., 13,157–160.
4. Benest, D.: 1974,’Effects of the Mass Ratio on the Existence of Retrograde Satellites in the Circular Plane Restricted Problem I’, Astron.Astrophys., 52,39–46
5. Benest, D.: 1975/,’Effects of the Mass Ratio on the Existence of Retrograde Satellites in the Circular Plane Restricted Problem II.’, Astron.Astrophys., 45,353–363