J. G. Williams & G. S. Benson (1971)
Early dynamical analysis of Neptune–Pluto resonance as a mechanism stabilizing Pluto’s orbit despite close encounters.
The work examines how resonant dynamics in the Neptune–Pluto system can protect Pluto from disruptive close approaches to Neptune. In the Lidov–Kozai resonance context, it is valuable as an early example of coupled resonant behavior where orbital angles can librate and constrain eccentricity and perihelion geometry. The implied takeaway is that long-term stability can arise from resonant phase protection rather than simple orbital separation, motivating later Kozai-in-resonance studies for trans-Neptunian objects.
Analytical celestial-mechanics study of resonant motion in the restricted three-body setting for the Neptune–Pluto configuration.
Celestial mechanics of mean-motion resonances and secular (Kozai/Lidov–Kozai-type) dynamics in hierarchical systems.
A fundamental work showing that Pluto is protected from close encounters by the 3:2 mean-motion resonance with Neptune and von Zeipel–Lidov–Kozai resonance.
— ES