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![Cover for O. Oleinik · Second-Order Equations With Nonnegative Characteristic Form (Paperback Book) [Softcover reprint of the original 1st ed. 1973 edition] (2012)](https://imusic.b-cdn.net/images/item/original/675/9781468489675.jpg?o-oleinik-2012-second-order-equations-with-nonnegative-characteristic-form-paperback-book&class=scaled&v=1469719822)