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200 1 $aMultidimensional inverse problems for differential equations$fde Lavrentiev, Romanov, Vasiliev
210   $aBerlin$cSpringer-Verlag$d1970
225 1 $aLecture notes in mathematics
300   $avolume 167.?
700  1$aLavrentiev,$bMikhail Mikhailovich$0350453
701  1$aRomanov,$0349481
701  1$aVasiliev$0349482
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