1. On the Computation, of a Nearly Parabolic Orbit from Three Observations of a Comet;Mamedov;Bull. Inst. teor. Astr.,1966
2. The Comparison of Computations of the Comet Orbit by the Gauss’ Method and the Method Offered by the Author;Illyinsky;Vestnik Kiev Univ., Ser. Astr.,1968
3. The Gauss Method for Solving Kepler’s Equation in Nearly Parabolic Orbits;Benima;Publ. astr. Soc. Pacific,1969
4. On the question of existence of Oort’s comet cloud;Vsehsvjatskij;Problems of Cosmic Physics,1968
5. Approaches of the Parabolic Comets to the Outer Planets;Sitarski;Acta astr.,1968