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100   $a20000920d1977----km-y0itay50------ba
101  1$aeng
200 1 $a<<The >>Deficiency Index Problem for Powers of Ordinary Differential Expressions$fde Kau fmann and Read
210   $aBerlin [etc.]$cSpringer-Verlag$d1977
225 1 $aLecture Notes in Mathematics$v621
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702  1$aRead,$bT.
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