External finite element approximations of eigenvalue problems M. Vanmaele; A. Ženíšek — 1993 ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique
An operator method for a numerical quadrature finite element approximation for a class of second-order elliptic eigenvalue problems in composite structures M. Vanmaele; R. Van Keer — 1995 ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique
On an internal approximation of a class of elliptic eigenvalue problems Vanmaele, M.; van Keer, R. — 1990 Equadiff 7