1-3 of 3 Books

Nonsmooth/nonconvex mechanics
By David Yang Gao,R. W. Ogden,G. E. Stavroulakis
Inverse problems for nonsmooth first order perturbations of the Laplacian
Inverse problems for nonsmooth first order perturbations of the Laplacian
By Mikko Salo

Nonsmooth mechanics and convex optimization
By Yoshihiro Kanno