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100   $a20001205d1991----km-y0itay50------ba
101 0 $aeng
200 1 $aExterior differential systems$fR. L. Br yant, S.S. Chern
210   $aNew York [etc.]$cSpringer-Verlag$d1991
215   $aVII, 475 p., 24 cm
225 1 $aMathematical Sciences Research Institute publications$v18
610 0 $aEquazioni differenziali parziali
610 0 $aSistemi differenziali esterni
676   $a515.35
702  1$aBryant,$bR.l.
702  1$aChern,$bShiing-Shen$f<1911-2004>
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