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