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101 0 $aeng
102   $aGB
200 1 $aSpectral theory and differential operators$fD. E. Edmunds, W. D. Evans
210   $aOxford$cClarendon Press$dcopyr. 1987
610 1 $aoperatori differenziali
610 1 $ateoria spettrale
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700  1$aEdmunds,$bDavid E.$0441628
702  1$aEvans,$bW. D.
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996   $aSpectral theory and differential operators$91501659
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