1
The Dynamical Behaviour of our Planetary System [E-Book] : Proceedings of the Fourth Alexander von Humboldt Colloquium on Celestial Mechanics /
2
Long Term Evolution of Planetary Systems [E-Book] : Proceedings of the Alexander von Humboldt Colloquium on Celestial Mechanics, held in Ramsau, Austria, 13–19 March 1988 /
3
Qualitative and Quantitative Behaviour of Planetary Systems [E-Book] : Proceedings of the Third Alexander von Humboldt Colloquium on Celestial Mechanics /
4
The Stability of Planetary Systems [E-Book] : Proceedings of the Alexander von Humboldt Colloquium on Celestial Mechanics, held at Ramsau, Styria, March 25–31, 1984 /