Juan Gil & Thomas Krainer 
Aspects of Boundary Problems in Analysis and Geometry [PDF ebook] 

Boundary problems constitute an essential field of common mathematical interest. The intention of this volume is to highlight several analytic and geometric aspects of boundary problems with special emphasis on their interplay. It includes surveys on classical topics presented from a modern perspective as well as reports on current research. The collection splits into two related groups: — analysis and geometry of geometric operators and their index theory- elliptic theory of boundary value problems and the Shapiro-Lopatinsky condition