@article{JOLT_2011_21_4_a2,
     author = {Alessandro Ottazzi and Ben Warhurst},
     title = {Contact and {1-Quasiconformal} {Maps} on {Carnot} {Groups}},
     journal = {Journal of Lie Theory},
     pages = {787--811},
     year = {2011},
     volume = {21},
     number = {4},
     url = {http://geodesic.mathdoc.fr/item/JOLT_2011_21_4_a2/}
}