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200 1 $aTheory of extremal problems$fA. D. Ioffe, V. M. Tikhomirov
210   $aAmsterdam$cNorth Holland$d1979
215   $ap.460$cill.$dcm 20
225 1 $aStudies in mathematics and its applications$v6
610 0 $aCalcolo delle variazioni
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700  1$aIoffe,$bAleksandr Davidovich$041266
701  1$aTikhomirov,$bVladimir Mikhailovich$041267
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