Contopoulos, George <br/><br/>
The Theory of Orbits in the Solar System and in Stellar Systems 

 - London:  Academic Press  1966 
 - 380p. ; 25 cm. 
<br/><br/> Proceedings of the 25th. Symposium of the International Astronomical Union hed in Thessaloniki, Greece, on 17-22 August, 1964 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomía