On Nonlinear Condensation Principles with Rates. R.J. Nessel; Dickmeis; W. — 1985 Manuscripta mathematica
On the Sharpness of Non-Optimal Approximation for Semigroup Operators. P.L. Butzer; W. Dickmeis — 1985 Manuscripta mathematica
A General Approach to Counterexamples in Numerical Analysis. W. Dickmeis; R.J. Nessel — 1984 Numerische Mathematik