00539nam a2200169Ia 4500003000900000008004100009040001600050080001300066100002300079245010400102250001200206260003900218300001600257490004100273650004100314650001400355IN-BaIIA211028s9999    xx            000 0 eng d  cIIA Library  a531bLAN  aLanczos, Cornelius 4aThe variational principles of mechanicscCornelius Lanczos                                           a4th ed.  aNew YorkbDover Publicationsc1970  axxix, 418p.  aDover books on physics and chemistry  aAstronomy and astrophysics thesaurus  aMechanics