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200 1 $aDifferential Equations$fL.E. El'sgol'ts
210   $aNew York$cGordon and Breach$cHindustan Publishing$d1961
210   $aDelhi
215   $avi, 359 p.$d22 cm
225 1 $aRussian Monographs and Texts on Advanced Mathematics and Physics$v4
610 0 $aEquazioni differenziali e integro$aDifferenziali
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