Periodic comet showers and planet X

This publication has 20 references indexed in Scilit:

• How stable is an astronomical clock that can trigger mass extinctions on Earth?
  Nature, 1984
• Dynamical constraints on the mass and perihelion distance of Nemesis and the stability of its orbit
  Nature, 1984
• Evidence from crater ages for periodic impacts on the Earth
  Nature, 1984
• Extinction of species by periodic comet showers
  Nature, 1984
• Are periodic mass extinctions driven by a distant solar companion?
  Nature, 1984
• Comets, Planet X and the orbit of Neptune
  Nature, 1983
• Comet showers and the steady-state infall of comets from the Oort cloud
  The Astronomical Journal, 1981
• The satellite of Pluto. III
  The Astronomical Journal, 1981
• A proposed search of the solar neighborhood for substellar objects
  Icarus, 1980
• The terrestrial cratering record
  Icarus, 1979