The stability of planetary systems proceedings of the Alexander von Humboldt Colloquium on Celestial Mechanics, held at Ramsau, Styria, March 25-31, 1984 - Duncombe, R. L.; Dvorak, R.; Message, P. J. (D. Reidel Publishing Company, 1984)
Reprinted from Celestial Mechanics, Vol. 34, Nos. 1-4