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101   $Aeng
102   $aDE
200 1 $a<<The>> Deficiency Index Problem for Powers of Ordinary Differential Expressions$fRobert M. Kauffman, Thomas T. Read and Anton Zettl
210   $aBerlin$cSpringer verlag$d1977
215   $aVI, 112 p.$cill.$d24 cm
225 2 $aLecture notes in mathematics$v621
410   $12001$aLecture notes in mathematics$v621
700  1$aKAUFFMAN,$BRobert M.$0438332
801  0$aIT$bsalbc$gISBD
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996   $aDeficiency index problem for powers of ordinary differential expressions$9262838
997   $aUNISA