1. P. Auscher, Wavelets with boundary conditions on the interval, in: [6], pp. 217–236.
2. O. Axelsson and V.A. Barker,Finite Element Solution of Boundary Value Problems. Theory and Computation (Academic Press, new York, 1984).
3. O.V. Besov, L.D. Kudryavzev, P.I. Lizorkin and S.M. Nikol'skij, Investigations in the theory of spaces of differentiable functions of several variables, Proc. Steklov Ins. Math. 1 (1990) 73–139.
4. J.H. Bramble, J.E. Pasciak and J. Xu, Parallel multilevel preconditioners, Math. Comp. 55 (1990) 1–22.
5. H.-J. Bungartz, Dünne Gitter und deren Anwendung bei der adaptiven Lösung der dreidimensionalen Poisson-Gleichung, Dissertation, TU München (1992).