1. Yeomans, D. K., Jacobson, R. A., Williams, B. G. & Choolas, P. W. in Cometary Exploration (ed. Gombosi, T. I.) (Central Research Institute for Physics, Budapest, 1983).
2. Sukhanov, A. A. & El'yasberg, P. E. Space Research Vol. 21 (USSR Academy of Sciences, Moscow, 1983).
3. Morley, T. A. Giotto Flight Dynamics Rep. No. 1, Vol. 1 (ESOC, 1984).
4. Savchenko, V. V. Jet Propulsion Lab. Publ. No. 84–82, 176–187 (1984).
5. Hechler, F. & Morley, T. A. Jet Propulsion Lab. Publ. No. 84-82, 188–202 (1984).