ed. V. Szebehe.NATO Advanced Study Institute (1981 : Italy):Applications of modern dynamics to Celestial mechanics and astrodynamics ; Proceedings.D. Reidel,1982.
ed. by V. G. Szebehely.The NATO-ASI (1978 : Italy):Instabilitics in dynamical systems applications to celestial mechanic;North Atlantic Treaty Organization.D. Reidel,1979.