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200 1 $aMaximum principles in differential equations$fMurray H. Protter, Hans F. Weinberger
210   $aEnglewood Cliffs$cPrentice-Hill$d1967
215   $aX, 261 p.$cill.$d23 cm
225 2 $aPrentice-Hall partial differential equations series
410  0$1001$12001$aPrentice-Hall partial differential equations series
606 0 $aEquazioni differenziali
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700  1$aPROTTER,$bMurray H.$040750
701  1$aWEINBERGER,$bHans F.$040586
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996   $aMaximum Principles in Differential Equations$9380409
997   $aUNISA