Some topics on variational inequalities and applications / J.L. Lions -- Free boundary problems for Poisson's equation / G. Stampacchia -- Nonlinear elliptic equations with nonlinear boundary conditions / H. Amann -- On the range of the sum of nonlinear operators / H. Brezis -- On the asymptotic behaviour of solutions of an equation arising in population genetics / L.A. Peletier -- Optimal control of a system governed by the Navier-Stokes equations coupled with the heat equation / C. Cuvelier -- Secondary o r direct bifurcation of a steady solution of the Navier-Stokes equations into an invariant torus / G. Iooss -- Application of the method of differential inequalities in singular perturbation problems / W.A. Harris, Jr. -- A singular perturbation problem of turning point type / P.P.N. de Groen -- Asymptotics for a class of perturbed initial value problems / B. Kaper -- On the solutions of perturbed differential equations / H.-D. Niessen -- On certain ordinary differential expressions and associated integral inequalities / W.N. Everitt and M. Giertz -- On Legendre's polynomials / Å. Pleijel -- Invariants and canonical forms for meromorphic second order differential equations / W. Jurkat, D.A. Lutz and A. Peyerimhoff -- On generalized eigenfunctions and linear transport theory / C.G. Lekkerkerker -- Integral-ordinary differential-boundary subspaces and spectral theory / A. Dijksma -- Some degenerated differential operators on vector bundles / R. Martini.