00603nam a2200193Ia 4500082001900000100002400019245004600043250000800089260002600097300002900123500009600152500000500248690000600253700000500259952010100264964001700365921001000382999001700392  a530.1bL252.VP  aLanczos, Cornelius.  aThe variational principles of mechanicsb  a4th  aNew YorkbDoverc1986  axxix, 418p. Index, Bibl.  a"Unabridged republication of the 4th ed. published by Univ. of Toronto Pr., Toronto, 1970".  a  a   a  00104070aISIbISId1998-10-09l0o530.1 L252.VPpDP22069r2019-02-14 00:00:00w2019-02-14yBK  abcdefg  a16385  c16385d16385