Oort, J. The structure of the cloud of comets surrounding the solar system and a hypothesis concerning its origin. Bull. Astron. Institutes Neth. 11, 91–110 (1950).
Whipple, F. L. A comet…
Oort, J. The structure of the cloud of comets surrounding the solar system and a hypothesis concerning its origin. Bull. Astron. Institutes Neth. 11, 91–110 (1950).
Whipple, F. L. A comet…