00649nam a2200205 a 450000100060000000300080000600500170001400800410003103500190007204000270009104100080011808200220012610000360014824500650018426000680024930000340031749000370035150400300038865000250041869877BD-RjUL20211209081933.0170415r19521949onca     b    000 0 eng    a(BD-RjUL)70089  aDLCcBD-RjULdDLCbeng  aeng00a531223bLAV 19521 aLanczos, Cornelius,d1893-1974.14aThe variational principles of mechanics /cCornelius Lanczos  aToronto :bUniversity of Toronto Press,c1949, [reprinted 1952]  axxv, 307 p. :bill. ;c23 cm.  aMathematical expositions,vno. 4  aBibliography: p. 365-366. 0aMechanics, Analytic.