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100   $a--------d--------km-y0itay50------ba
101 0 $aeng
200 1 $a<<The >>Deficiency Index Problem for Powers of Ordinary Differential Expressions$fRobert M. Kauffman, Thomas T. Read and Anton Zettl
210   $aBerlin [etc.]$cSpringer-Verlag$d1977
215   $avi, 112 p.$d24 cm
225 1 $aLecture Notes in Mathematics$v621
610 0 $aEquazioni differenziali e integro$aDifferenziali
676   $a517.37
700  1$aKaufman,$bRobert McKenzie$f<1941- >$0349749
702  1$aRead,$bThomas T.
702  1$aZettl,$bAnton
801  0$aIT$bUNINA$gRICA$2UNIMARC
901   $aBK
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952   $a15-138$b9582 F.T.$fFI1
959   $aFI1
996   $aDeficiency Index Problem for Powers of Ordinary Differential Expressions$9355427
997   $aUNINA