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100   $a20090521d1977----km-y0itay50------ba
101   $aeng
102   $aSU
105   $a||||||||001yy
200 1 $aDifferential equations and the calculus of variations$fL. Elsgolts$gtranslated from the russian by George Yankovsky
210   $aMoscow$cMir publishers$d1977
215   $a440 p.$d21 cm
300   $aRipr. facs. dell'ed. del 1970
606 0 $aEquazioni differenziali
676   $a515.35
700  1$aELSGOLTS,$bL.$0604283
702  1$aYANKOVSKY,$bGeorge
801  0$aIT$bsalbc$gISBD
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979   $aRSIAV7$b90$c20090521$lUSA01$h0941
996   $aDifferential equations and the calculus of variations$91119723
997   $aUNISA