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100   $a20000920d1970----km-y0itay50------ba
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200 1 $aPseudo-Differential Operators
210   $aNew York$cs.e.$d1970
225 1 $aNew York University Institute of Mathematical Sciences
300   $aAn introduction lectures given in 1967-68 a t the courant institute notes prepared with the assistance of R. Vaillancourt. Revise d edition , April 1970.
700  1$aFriedrichs,$bKurt Otto$040614
801  0$aIT$bUNINA$gRICA$2UNIMARC
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