@article{MAN_1994__300_2_165267,
     author = {B. Franchi and S. Gallot and R.L. Wheeden},
     title = {Sobolev and isoperimetric inequalities for degenerate metrics.},
     journal = {Mathematische Annalen},
     pages = {557--572},
     publisher = {mathdoc},
     volume = {300},
     number = {2},
     year = {1994},
     zbl = {0830.46027},
     url = {http://geodesic.mathdoc.fr/item/MAN_1994__300_2_165267/}
}