00575nam a2200169Ia 4500003000900000008004100009020001800050040001600068080001700084100002100101245015100122260002700273300001500300490003900315650002400354650002700378IN-BaIIA211028s9999    xx            000 0 eng d  a3-540-40749-9  cIIA Library  a521.1bBEU-1  aBeutler, Gerhard 0aMethods of celestial mechanicsbvol.1, physical, mathematical and numerical principlescGerhard Beutler                                             aBerlinbSpringerc2005  axvi, 464p.  aAstronomy and astrophysics library  aCelestial mechanics  aTheory of perturbation