1. and , ‘New Aspects of cosine schemes for second order hyperbolic equations’, in Advances in Computer Methods for Partial Differential Equations, V. R. Vichnevetsky and R. S. Stepleman (Eds.), IMACS-1984, pp. 540-545.
2. Galerkin Finite Element Methods for Parabolic Problems, Springer-Verlag, Berlin, Heidelberg, New York, Tokyo, 1984.
3. Higher order local accuracy by averaging in the finite element method