Elliptic Partial Differential Equations of Second Order (Reprint of the 2nd ed. Berlin Heidelberg New York )

From the reviews:"This is a book of interest to any having to work with differential equations, either as a reference or as a book to learn from.

The authors have taken trouble to make the treatment self-contained.

It (is) suitable required reading for a PhD student.

Although the material has been developed from lectures at Stanford, it has developed into an almost systematic coverage that is much longer than could be covered in a year's lectures".

Newsletter, New Zealand Mathematical Society, 1985 " ... as should be clear from the previous discussion, this book is a bibliographical monument to the theory of both theoretical and applied PDEs that has not acquired any flaws due to its age.

On the contrary, it remains a crucial and essential tool for the active research in the field.

In a few words, in my modest opinion, “. . . this book contains the essential background that a researcher in elliptic PDEs should possess the day s/he gets a permanent academic position. . . .”  SIAM Newsletter