Quasiconformal maps between compact polyhedra are quasisymmetric J. HeinonenA. Hinkkanen Indiana University Mathematics Journal 1996 text pdf 10.1512/iumj.1996.45.1330 10.1512/iumj.1996.45.1330 en Indiana Univ. Math. J. 45 (1996) 997 - 1020 state-of-the-art mathematics http://iumj.org/access/