* "Mathematical Methods for Optimal Control" (co-authored with Theodor Precupanu): This book is a classic text in the field of optimal control, covering topics like functional analysis, convex analysis, and applications to various control problems.
* "Nonlinear Semigroups and Differential Equations in Banach Spaces" (co-authored with Nicolae Pavel): This book focuses on the theory of nonlinear semigroups and their applications to solving partial differential equations.
* "Partial Differential Equations": A textbook on partial differential equations, covering topics like elliptic, parabolic, and hyperbolic equations.
* "Convexity and Optimization in Banach Spaces": This book explores the theory of convexity and its applications to optimization problems in Banach spaces.
* "Differential Equations": This textbook covers a broad range of topics in ordinary differential equations, including existence and uniqueness theorems, stability analysis, and applications.
These are just some of the many books and research articles written by Viorel Barbu. His contributions to mathematics have earned him international recognition and have significantly impacted the fields of optimal control and partial differential equations.