[1]
Gauld, D. and Väisälä, J. 1979. Lipschitz and quasiconformal flattening of spheres and cells.
Annales Fennici Mathematici
. 4, 2 (Aug. 1979), 371–382. DOI:https://doi.org/10.5186/aasfm.1978-79.0405.