Visi 2 Yu.V. Egorov izlaidumi pie Paperback Book un Hardc...
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![Cover for Yu.V. Egorov · Foundations of the Classical Theory of Partial Differential Equations (Paperback Book) [Softcover reprint of the original 1st ed. 1998 edition] (1998)](https://imusic.b-cdn.net/images/item/original/254/9783540638254.jpg?yu-v-egorov-1998-foundations-of-the-classical-theory-of-partial-differential-equations-paperback-book&class=scaled&v=1418061611)
![Cover for Yu.V. Egorov · Partial Differential Equations II: Elements of the Modern Theory. Equations with Constant Coefficients - Encyclopaedia of Mathematical Sciences (Hardcover Book) [1994 edition] (1994)](https://imusic.b-cdn.net/images/item/original/016/9783540520016.jpg?yu-v-egorov-1994-partial-differential-equations-ii-elements-of-the-modern-theory-equations-with-constant-coefficients-encyclopaedia-of-mathematical-sciences-hardcover-book&class=scaled&v=1418061612)