1. On the multi-level splitting of finite element spaces
2. The hierarchical basis multigrid method
3. Hierarchical Basis Preconditioners in Three Dimensions
4. The hierarchical basis multigrid method and incomplete LU decomposition. In Domain Decomposition Methods in Scientific and Engineering Computing: Proceedings of the Seventh International Conference on Domain Decomposition, Contemporary Mathematics, vol.180. American Mathematical Society: Providence, RI, 1994; 163-173.
5. A hierarchical basis multigrid method for unstructured grids. In Fast Solvers for Flow Problems. Proceedings of the Tenth GAMM-Seminar Kiel, Notes on Numerical Mathematics, vol.49. Vieweg-Verlag: Braunschweig, 1995; 1-13.