1. E. M. Drobyshevskii, “History of Titanium, Rings and Magnetic Field of Saturn and the Nature of Short-Periodic Comets,” Preprint Fiz.-Tekh. Inst. No. 674 (LIYaF, Leningrad, 1980).
2. E. M. Drobyshevskii, “Danger of Explosion of Callisto and Priority of Space Mission,” Zh. Tekh. Fiz. 69(9), 10–14 (1999) [Tech. Phys. 44, 1009 (1999)].
3. S. I. Ipatov, Migration of Celestial Bodies in the Solar System (Editorial URSS, Moscow, 2000) [in Russian].
4. V. P. Konopleva, “On the Existence of the Jupiter and Saturn Families among Non-Periodic Comets,” Komet. Tsirk. No. 258 (1980).
5. S. G. Natanson, “On Origin of Comets,” Works of Astron. Observ. of Petrograd. Univ., 18–24 (1923).