1. Über Approximationsmasse singulärer Integrale;Lehnhoff,1977
2. Lokale Approximationsmaβe und Nikolskii-Konstanten für positive lineare Operatoren;Lehnhoff,1979
3. H.-G. Lehnhoff, Local Nikolskii constants for a special class of Baskakov operators, to appear.
4. Bernstein Polynomials;Lorentz,1953
5. Linear Combinations of Linear Positive Operators and Generating Relations in Special Functions;Rathore,1973