@article{05875519,
title = {Stability of mappings with bounded distortion in the Sobolev norm on the John domains of Heisenberg groups.},
journal = {Sibirskij Matematicheskij Zhurnal},
volume = {50},
year = {2009},
pages = {526-546},
zbl = {1224.30107},
language = {en},
url = {http://dml.mathdoc.fr/item/05875519}
}
Isangulova, D.V. Stability of mappings with bounded distortion in the Sobolev norm on the John domains of Heisenberg groups.. Sibirskij Matematicheskij Zhurnal, Tome 50 (2009) pp. 526-546. http://gdmltest.u-ga.fr/item/05875519/