1. H.-P. Blatt, E. B. Saff, Behavior of zeros of polynomials of near best approximation, J. Approx. Theory 46 (1986), 323 - 344.
2. H.-P. Blatt, E. B. Saff, M. Simkani, Jentzsch-Szegő type theorems for the zeros of best approximants, J. Lond. Math. Soc. 38 (1988), No. 2, 307 - 316.
3. H.-P. Blatt, R. Grothmann, R. K. Kovacheva, Poles and alternation points in real rational Chebyshev approximation, Comput. Methods Funct. Theory 3 (2003), No. 1 - 2, 165 - 177.
4. H.-P. Blatt, R. Grothmann, R. K. Kovacheva, The local effect of zeros on the convergence of rational approximants, submitted.
5. H.-P. Blatt, R. K. Kovacheva, Growth behaviour and zero distribution of rational approximants, to appear in Constr. Approx.