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100   $a2002009051891975----y0itay0103----ba
101 0 $aeng
102   $aUS
200 1 $aIntroduction to spectral theory: selfadjoint ordinary differential operators$fB. M. Levitan, I. S. Sargsjan
210   $aProvidence$cAmerican Mathematical Society$dcopyr. 1975
215   $aXI, 525 p.$cill.$d23 cm
225 2 $aTranslations of mathematical monographs$v39
410  0$1001000324643$12001$aTranslations of mathematical monographs$v39
606 1 $aOperatori differenziali
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700  1$aLEVITAN,$bB. M.$048792
701  1$aSARGSJAN,$bI. S.$0754678
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969   $aSCI
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996   $aIntroduction to spectral theory: selfadjoint ordinary differential operators$91518747
997   $aUNISA