1. Approximation by trigonometric polynomials in a certain class of periodic functions of several variables;Babenko;Dokl. Akad. Nauk SSSR,1960
2. Blending approximation with sine functions;Baszenski,1992
3. Parallel multilevel preconditioners;Bramble;Math. Comp.,1990
4. Guide to multigrid development;Brandt,1982
5. Dünne Gitter und deren Anwendung bei der adaptiven Lösung der dreidimensionalen Poisson-Gleichung;Bungartz,1992