00696nam a2200205Ia 4500003000900000008004100009040001600050080001300066100003000079245010400109250001200213260003900225300001600264490004100280650004100321650001400362942000700376999001700383952009000400IN-BaIIA211028s9999    xx            000 0 eng d  cIIA Library  a531bLAN  aLanczos, Cornelius918321 4aThe variational principles of mechanicscCornelius Lanczos                                           a4th ed.  aNew YorkbDover Publicationsc1970  axxix, 418p.  aDover books on physics and chemistry  aAstronomy and astrophysics thesaurus  aMechanics  cBK  c10741d10741  00104070aBANbBANcGENd1993-08-03l0o531/ LANp11652r2021-11-05w1993-08-03yBK