1. Whittaker constants;Buckholtz,1971
2. Abel-Gončarov polynomial expansions;Frank;J. Approximation Theory,1974
3. On a generalization of Fourier series;Gel'fond;Mat. Sb. N. S.,1951
4. F. Haslinger, On the geometry in linear spaces with Hilbert norms, Rev. Roumaine Math. Pures Appl., in press.
5. Basic sequences, biorthogonal systems and norming sets in Banach and Fréchet spaces;Kadec;Studia Math.,1965