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200 1 $aSpectral Theory and Differential Operators$fDavid Eric Edmunds, W.D. Evans
210   $aOxford$cClarendon Press$d1987
225 1 $aOxford mathematical monographs
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700  1$aEdmunds,$bDavid Eric$052062
702  1$aEvans,$bW.D.
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