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200 1 $aPerturbation theory of eigenvalue problems$fFranz Rellich$gassisted by J. Berkowitz
210   $aNew York$cGordon and Breach$d1969
215   $aX, 127 p.$cill.$d23 cm
225 2 $aNotes on mathematics and its applications
410  0$12001$12001$aNotes on mathematics and its applications
606 0 $aTeoria spettrale
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700  1$aRELLICH,$bFranz$057700
702  1$aBERKOWITZ,$bJ.
801  0$aIT$bsalbc$gISBD
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996   $aPerturbation theory of eigenvalue problems$9384804
997   $aUNISA