1. Agarwal, J., Müller, M., and Grün, E.: Space Sci. Rev., this issue, , doi: 10.1007/s11214-006-9139-1.
2. A'Hearn, M. F., Millis, R. L., Schleicher, D. G., Osip, D. J., and Mirch, P. V.: 1995, Icarus 118, 223.
3. Barucci, M. A., Fulchignoni, M., and Rossi, A.: Space Sci. Rev., this issue, , doi: 10.1007/s11214-006-9029-6.
4. Belton, M. J., and Members of the Deep Impact Science Team: 2006, The Internal Structure of Jupiter Family Comet Nuclei: The Talps or Layered Pile Model, American Astronomical Society, DPS meeting 38, 17.08.
5. Belyaev, N. A., Kresak, L., Pittich, E. M., and Pushkarev, A. N.: 1986, Catalogue of Short-Period Comets, Astron. Inst. Slovak Academy of Sciences, Bratislava.