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200 1 $aNotes on time decay and scattering for some hyperbolic problems$fby Morawetz, C.S.
210   $aPhiladelphia$cSIAM$d1975
225 1 $aRegional conference series in applied mathematics$v19
610 0 $aEquazioni differenziali alle derivate parziali
700  1$aMorawetz,$bCathleen S.$042068
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