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200 1 $aIntermediate problems for eigenvalues$etheory and ramifications$fAlexander Weinstein and William Stenger
210   $aNew York$bAcademic Press$d1972
215   $aXI, 234 p.$bill.$d24 cm
225  2$aMathematics in science and engineering$v89
410 1 $1001000333593$12001$aMathematics in science and engineering$v89
606  0$aMatematica
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996   $aIntermediate problems for eigenvalues$91511904
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