@article{GFA_1995__5_4_58195,
     author = {G.A. Margulies and G.D. Mostow},
     title = {The {Differential} of a {Quasi-conformal} {Mapping} of a {Carnot-Caratheodry} {Space.}},
     journal = {Geometric and functional analysis},
     pages = {402--433},
     publisher = {mathdoc},
     volume = {5},
     number = {4},
     year = {1995},
     zbl = {0910.30020},
     url = {http://geodesic.mathdoc.fr/item/GFA_1995__5_4_58195/}
}