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100   $a20001205d1973----km-y0itay50------ba
101 0 $aeng
102   $aUS
105   $ay-------001yy
200 1 $aSecond order equations with nonnegative characteristic form$fO. A. Oleinik and E. V. Radkevic$gtranslated from Russian by Paul C. Fife
210   $aProvidence$cAmerican Mathematical Society$d1973
215   $aVII, 259 p.$d25 cm
610 0 $aEquazioni differenziali alle derivate parziali
676   $a515.353
700  1$aOleinik,$bO.A.$0335063
701  1$aRadkevic,$bE.V.$0335064
702  1$aFile,$bPaul C.
801  0$aIT$bUNINA$gRICA$2UNIMARC
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912   $a990001268110403321
952   $a6-M-18$b15520$fMA1
952   $a04 012-23$bIRC 395/L$fDINCH
952   $a02 30 E 16$b1884$fFINBN
959   $aMA1
959   $aDINCH
959   $aFINBN
996   $aSecond order equations with nonnegative characteristic form$9380209
997   $aUNINA