@article{GDZPPN002112663, title = {Definitions of quasiconformality.}, journal = {Inventiones mathematicae}, volume = {121}, year = {1995}, pages = {61-80}, zbl = {0832.30013}, url = {http://dml.mathdoc.fr/item/GDZPPN002112663} }
Heinonen, Juha; Koskela, Pekka. Definitions of quasiconformality.. Inventiones mathematicae, Tome 121 (1995) pp. 61-80. http://gdmltest.u-ga.fr/item/GDZPPN002112663/