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 ZealandMathematical Society, 1985"Primarily addressed to graduate students this elegant book is accessible and useful to a broad spectrum of applied mathematicians".Revue Roumaine de Mathématiques Pures etAppliquées, 1985 | Elliptic Partial Differential Equations Of Second Order by David Gilbarg, Paperback | Indigo Chapters