Certain linear extremal problems in Bergman spaces of analytic fucntions Dmitry KhavinsonM. Stessin Bergman spacesconformal mappingp-harmonic functions Indiana University Mathematics Journal 1997 text pdf 10.1512/iumj.1997.46.1375 10.1512/iumj.1997.46.1375 en Indiana Univ. Math. J. 46 (1997) 933 - 974 state-of-the-art mathematics http://iumj.org/access/