1. Interplanetary encounters
Author: / by Ernst J. Opik
Library: Central Library and Documents Center of Mazandaran University (Mazandaran)
Subject: Celestial mechanics.,Gravitation.,Planets- Orbits.
Classification :
QB355
.
O6
1976


2. Interplanetary encounters : close-range gravitational interactions
Author: Opik, Ernst Julius
Library: Central Library of Sharif University of Technology (Tehran)
Subject: ، Celestial mechanics,، Gravitation,، Planets - Orbits
Classification :
QB
355
.
O33

