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100   $a20001010d1970----km-y0itay50------ba
101 0 $aeng
105   $ay-------001yy
200 1 $a<<The >>variational principles mechanics$fC. Lanczos
205   $a4. ed.
210   $aToronto$cUniversity of Toronto$d1970
215   $aXXIX, 418 p.$d22 cm
225 1 $aMathematical expositions$v4
700  1$aLanczos,$bCornelius$027778
801  0$aIT$bUNINA$gRICA$2UNIMARC
901   $aBK
912   $a990000831710403321
952   $a02 65 B 8$b2845$fFINBN
959   $aFINBN
996   $aVariational principles mechanics$9348265
997   $aUNINA
DB    $aING01