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101 0 $aeng
200 1 $aGeometrical optics and related topics$fFerruccio Colombini, Nicolas Lerner, editors
210   $aBoston [MA]$cBirkhauser$d1997
215   $avi, 361 p.$d25 cm
225 1 $aProgress in nonlinear differential equations and their applications$v32
610 0 $aUrti e singolarita
610 0 $aEquazioni e sistemi non lineari del secondo ordine
610 0 $aSpazi di sobolev
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702  1$aLerner,$bNicolas
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