1-4 of 4 Books
Boundary Value Problems, Weyl Functions, and Differential Operators
Boundary Value Problems, Weyl Functions, and Differential Operators
By Jussi Behrndt

Hardy Type Inequalities on Time Scales
By Ravi P. Agarwal,Donal O'Regan,Samir H. Saker

Lectures on Convex Geometry
By Daniel Hug,Wolfgang Weil
Spectral Geometry of Partial Differential Operators (Open Access)
Spectral Geometry of Partial Differential Operators (Open Access)
By Michael Ruzhansky,Makhmud Sadybekov,Durvudkhan Suragan