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101   $aeng
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200 1 $aPropagation and interaction of singularities in nonlinear hyperbolic problems$fMichael Beals
210   $aBoston [etc.]$cBirkhäuser$d1989
215   $a143 p.$d23 cm
225 2 $aProgress in nonlinear differential equations and their applications$v3
410  0$12001$aProgress in nonlinear differential equations and their applications
606 0 $aEquazioni iperboliche
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700  1$aBEALS,$bMichael$042308
801  0$aIT$bsalbc$gISBD
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996   $aPropagation and Interaction of Singularities in Nonlinear Hyperbolic Problems$9349713
997   $aUNISA