1. Fourier-Analysis and Approximation;Butzer,1971
2. Constructive Approximation;DeVore,1993
3. Projections with norms smaller than those of the ultraspherical and Laguerre partial sums;Görlich,1981
4. A lower bound for projection operators onL1;Görlich;Ark. Mat.,1986
5. Asymptotic minimal projection constants for Lebesgue spaces;Görlich;C. R. Math. Rep. Acad. Sci. Canada,1994