An Overview of the Method of Lower and Upper Solutions for ODEs -- On the Long-time Behaviour of Solutions to the Navier-Stokes Equations of Compressible Flow -- Periodic Solutions of Systems with p-Laplacian-like Operators -- Mechanics on Riemannian Manifolds -- Twist Mappings, Invariant Curves and Periodic Differential Equations -- Variational Inequalities, Bifurcation and Applications -- Complex Dynamics in a Class of Reversible Equations -- Symmetry and Monotonicity Results for Solutions of Certain Elliptic PDEs on Manifolds -- Nielsen Number and Multiplicity Results for Multivalued Boundary Value Problems -- Bifurcation Theory and Application to Semilinear Problems near the Resonance Parameter -- Orientation and Degree for Fredholm Maps of Index Zero Between Banach Spaces -- On the Method of Upper and Lower Solutions for First Order BVPs -- Nonlinear Optimal Control Problems for Diffusive Elliptic Equations of Logistic Type -- On The Use of Time-Maps in Nonlinear Boundary Value Problems -- Some Aspects of Nonlinear Spectral Theory -- Asymmetric Nonlinear Oscillators -- Hopf Bifurcation for a Delayed Predator-Prey Model and the Effect of Diffusion -- Galerkin-Averaging Method in Infinite-Dimensional Spaces for Weakly Nonlinear Problems -- PBVPs for Ordinary Impulsive Differential Equations -- Homoclinic and Periodic Solutions for Some Classes of Second Order Differential Equations -- Global Bifurcation for Monge-Ampรจre Operators -- Remarks on Boundedness of Semilinear Oscillators -- The Dual Variational Method in Nonlocal Semilinear Tricomi Problems -- Symmetry Properties of Positive Solutions of Nonlinear Differential Equations Involving the p-Laplace Operator -- A Maximum Principle with Applications to the Forced Sine-Gordon Equation -- Lipschitzian Regularity Conditions for the Minimizing Trajectories of Optimal Control Problems -- Abstract Concentration Compactness and Elliptic Equations on Unbounded Domains