Periodic orbits, stability and resonances  proceedings of a symposium conducted by the University of São Paulo, Brasil, 4-12 September, 1969 
edited by G. E. O. Giacaglia 
 - Dordrecht  D. Reidel Publishing  1970 
 - xiv, 530p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astrodynamics<br/>Celestial mechanics
<br/><br/><label>Universal Decimal Class. No.: </label>521.2  / PER