Maymeskul, V. V.; Saff, E. B.; Stylianopoulos, Nikos S. (2002)
For a bounded Jordan domain G with quasiconformal boundary L, two-sided estimates are obtained for the error in best L2(G) polynomial approximation to functions of the form (z - τ)β, β > -1, and (z - τ)m logl(z - τ), m > ...