Biancamaria Della Vecchia Giuseppe Mastroianni József Szabados Generalized Bernstein polynomials with Pollaczek weight. 180-196 2009 159 Journal of Approximation Theory 2 http://dx.doi.org/10.1016/j.jat.2009.02.008 db/journals/jat/jat159.html#VecchiaMS09