Estimates for F-Harmonic Measures and Oksendal-s Theorem for Quasiconformal Mappings J. HeinonenO. Martio Indiana University Mathematics Journal 1987 text pdf 10.1512/iumj.1987.36.36038 10.1512/iumj.1987.36.36038 en Indiana Univ. Math. J. 36 (1987) 659 - 683 state-of-the-art mathematics http://iumj.org/access/